Decoration, first SXI image

Space Weather Prediction Center


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Previous Status Reports

GOES SXI Operational Status (2007-08-24)

****** GOES-12 SXI Out of Commission Indefinitely ******

On 12 April 2007 the ability to point the SXI and XRS solar sensors aboard the GOES-12 spacecraft was lost due to the failure of a component in the electronics box that controls the north-south motion of both instruments. Although the SXI and XRS instruments continue to function, the Sun now enters the field of view only for a brief period twice a year at the equinoxes.

Since it appears highly unlikely that the pointing functionality can be ever be recovered, routine GOES-12 SXI and XRS observations have been suspended indefinitely. Some limited imaging may be attempted for engineering purposes during the equinoxes, but there is no plan at present to reactivate SXI and XRS in operational mode.


GOES SXI Operational Status (2004-10-27)

***** GOES X-RAY CALIBRATION SOUNDING ROCKET FLIGHT *****

On Friday, October 15th a sounding rocket carrying the Avalanche X-ray Spectrometer (AXS) was launched from White Sands Missile Range. It obtained the first ever on-orbit calibration information for Solar X-ray instrumentation aboard NOAA's GOES satellites. The spectrometer, developed by the University of Alaska's Geophysical Institute, with support from NOAA/NESDIS, is precisely calibrated and took measurements of the Sun during its flight which will be used as 'Solar truth' applied to GOES calibrations. The rocket flight was funded by NASA in support of its TIMED/SEE solar instrument, which was developed at the University of Colorado Laboratory for Atmospheric and Space Physics (LASP). More details on the rocket program are available at LASP.

GOES spacecraft carry two types of Solar X-ray instrumentation, the disk-integrated X-ray Sensors (XRSs) and the Solar X-ray Imager (SXI). This in-flight calibration of these instruments marks an important 'first' for NOAA. Precise calibration of X-ray instrumentation is challenging, even in a laboratory environment. In addtion, instrument performance tends to shift or degrade on-orbit due to general aging and space radiation effects. Thus, the absolute response of the instrument becomes even more uncertain with time. Rocket underflights with well calibrated reference instruments are the best way to maintain knowledge of an instrument's performance over its orbital lifetime.

The improved calibration of the GOES XRS and SXI will allow improvements in the accuracy of NOAA Space Weather Prediction Center operational products such as flare magnitudes and X-ray backgrounds as well as potential products such as solar plasma conditions. In addition, this calibration will allow adjustments to previous measurements such that a consistent solar 'climatology' for the past three decades can be generated. Finally, knowledge of instrument degradation over orbital lifetime provides valuable input to the requirements and design of future instrumentation.

Operationally, users of SXI data will see several minor to moderate duration interruptions in regular product generation over the next couple of weeks to support this calibration effort. The launch occurred on schedule Friday, Oct. 15 at 17:28 UT. For approximately a 4-hour period centered on the launch time, the SXI did not take its normal sequence of images. During the first and last hours of this period, SXI did not image the Sun - it took 'dark' frames and calibration frames to estimate 'off-band' light-leakage due to pinholes in SXI filters. During the central 2 hours, SXI imaged the Sun at rapid cadence, but with specialized exposures which do not provide full utility for forecast operations.

In addition, prior to the launch, possibly as early as Friday, Oct 8 short (<1 hr) tests of these imaging sequences will be run for validation purposes. After the launch, there will be two periods of additional calibration each lasting approximately 1hr, probably separated by about 1 week.

Instrument:

The current basic SXI sequence, shown in the table below, is repeated every eight minutes. No substantial changes have been made since November 2003. The pairing of short and long exposures in the PTHN filter every four minutes allow for the creation of extended dynamic range composite images. A total of four long PTHN exposures are taken during the sequence to allow possible co-adding of images for noise reduction. Approximately once every two hours, a set of test images is taken which results in a minor interruption to the patrol sequence. In addition, once every six hours, images are made in five filter bands. The phasing of the five filter image sequence is such that it coincides with multiple filter imaging done by the ESA/NASA SOHO spacecraft's EIT instrument at 0100, 0700, 1300, and 1900UT.

Current Patrol Sequence Images
Order Image
Type
Exposure
(sec)
Filter Gain
(V)
Cadence
(min)
1,5 Flare 0.060 PTHN 500 4
2,4,6,8 Active Region 3.000 PTHN 500 2
3 Flare 3.000 PMED 500 8
7 Flare 3.000 BTHN 500 8

A list of past sequences run is available (though it may not yet include the very latest sequences).

Regularly planned interruptions of SXI data are as follows:

Data System:

The latest SXI images continue to be available within minutes of the observation at NOAA/NGDC in browse, FITS, and MPEG formats. We have maintained real-time product generation at the level of 99.85% since December 1, 2003. This is well above NOAA's National Centers for Environmental Prediction goal of 98.5%. Missing products will be periodically be restored and made available at NGDC . For a summary of the SXI image coverage, see the NGDC Summary page. The approximate times of currently unfilled major 'data voids' are:

Notice will be posted when these gaps in data are filled.


GOES SXI Operational Status (2004-06-04)

***** JUNE 8TH TRANSIT OF VENUS IN SXI *****

On June 8th, from about 05:13 to about 11:25 UT Venus will pass between the Sun and the Earth. This tranist of Venus is the first in 122 years. In SXI images, Venus will appear as a dark disk about 12 pixels (1 arcminute) in diameter. This is about 1/30th of the Sun's apparent diameter. It should be most visible in the 3 second PTHN filter images that are taken once every two minutes. Venus will move about 6.4 arcseconds (1.3 pixels) between consecutive PTHN images. The path across the disk will be from the southeast to the southwest.

Historically, transits of Venus were used to determine the absolute scale of the solar system. For SXI, the data taken during the transit of Venus will provide potential benefits to understanding the SXI point spread function, scattered light, and background intensity. There may even be a possibility of using the SXI data to study the atmosphere of Venus! Impacts on Solar flare locations and other operational uses of SXI images should be minimal since Venus will cover only 1/1000th of the Sun's disk.

Instrument:

The current basic SXI sequence, shown in the table below, is repeated every eight minutes. The pairing of short and long exposures in the PTHN filter every four minutes allow for the creation of extended dynamic range composite images. A total of four long PTHN exposures are taken during the sequence to allow possible co-adding of images for noise reduction. Approximately once every two hours, a set of test images is taken which results in a minor interruption to the patrol sequence. In addition, once every six hours, images are made in five filter bands. The phasing of the five filter image sequence is such that it coincides with multiple filter imaging done by the ESA/NASA SOHO spacecraft's EIT instrument at 0100, 0700, 1300, and 1900UT.

Current Patrol Sequence Images
Order Image
Type
Exposure
(sec)
Filter Gain
(V)
Cadence
(min)
1,5 Flare 0.060 PTHN 500 4
2,4,6,8 Active Region 3.000 PTHN 500 2
3 Flare 3.000 PMED 500 8
7 Flare 3.000 BTHN 500 8

A list of past sequences run is available (though it may not yet include the very latest sequences).

Regularly planned interruptions of SXI data are as follows:

Data System:

The latest SXI images continue to be available within minutes of the observation at NOAA/NGDC in browse, FITS, and MPEG formats. We have maintained real-time product generation at the level of 99.85% since December 1, 2003. This is well above NOAA's National Centers for Environmental Prediction goal of 98.5%. Missing products will be periodically be restored and made available at NGDC . For a summary of the SXI image coverage, see the NGDC Summary page. The approximate times of currently unfilled major 'data voids' are:

Notice will be posted when these gaps in data are filled.


GOES SXI Operational Status (2003-11-12)

*** SXI Returns (again) to Imaging Nov. 12 21:45UT ***

SXI appears to have lost one of six entrance pre-filters that shield the optics from the visible and UV radiation of the Sun, while permitting X-rays to pass through. The result of the failure is a bright off-band light leak that renders the OPEN filter position unusable. The filter failure occurred at Nov. 05 12:05UT. A new imaging sequence, with a 2 minute cadence on our PTHN filter is now running. We are continuing to optimize the scaling of our PNG format browse images.

Instrument:

The current basic SXI sequence, shown in the table below, is repeated every eight minutes. The pairing of short and long exposures in the PTHN filter every four minutes allow for the creation of extended dynamic range composite images. A total of four long PTHN exposures are taken during the sequence to allow possible co-adding of images for noise reduction. Approximately once every two hours, a set of test images is taken which results in a minor interruption to the patrol sequence. In addition, once every six hours, images are made in five filter bands. The phasing of the five filter image sequence is such that it coincides with multiple filter imaging done by the ESA/NASA SOHO spacecraft's EIT instrument at 0100, 0700, 1300, and 1900UT.

Current Patrol Sequence Images
Order Image
Type
Exposure
(sec)
Filter Gain
(V)
Cadence
(min)
1,5 Flare 0.060 PTHN 500 4
2,4,6,8 Active Region 3.000 PTHN 500 2
3 Flare 3.000 PMED 500 8
7 Flare 3.000 BTHN 500 8

A list of past sequences run is available (though it may not yet include the very latest sequences).

Regularly planned interruptions of SXI data are as follows:

Data System:

The latest SXI images continue to be available within minutes of the observation at NOAA/NGDC in browse, FITS, and MPEG formats. The table below shows the fraction of the expected products (based on the instrument image count) that have been produced. The missing products are will periodically be restored and made available at NGDC .
Data Product Generation
Real-Time NGDC Archive
Month Level-0 Level-1 Level-0 Level-1
Jan 99.40% 96.29% 99.71% 96.56%
Feb 97.26% 94.24% 97.27% 97.25%
Mar 99.61% 99.21% 99.63% 99.23%
Apr 99.93% 99.73% 99.94% 99.73%
May 99.92% 99.60% 99.99% 99.66%
Jun 97.78% 97.19% 97.87% 97.28%
Jul 96.91% 96.74% 96.92% 96.75%
Aug 98.78% 98.58% 98.81% 98.60%

We are continuing to work to raise our real-time data availability to our goal of 99.90% on a monthly basis. The approximate times of currently unfilled major 'data voids' are:

Notice will be posted when these gaps in data are filled.


GOES SXI Operational Status (2003-11-05)

*** SXI Temporary Shutdown at 14:48 UT Today ***

An anomaly occurred with the SXI instrument at approximately 12:05UT today in which OPEN position images appeared similar to, but not identical to background frames. The SXI was commanded to Safe mode at 14:48UT pending further investigation. The symptoms associated with the anomaly are:

These symptoms may be suggestive of the total failure of an entrance filter which is allowing the telescope interior to be 'flooded' with white light. If this is the case, a couple of confirmation tests in the next few days should be sufficient. We will resume operations as soon as it is deemed safe. However, if we have lost the OPEN filter position, we will have to greatly re-work our operational image sequences to rely on other filter positions, which for the most part appear little affected.

Instrument:

The routine patrol sequence run prior to 2003-11-05 will likely be changed when operations resume. The current basic SXI sequence, shown in the table below, is repeated every eight minutes. The pairing of short and long exposures in a given filter allow for the creation of extended dynamic range composite images. Approximately once every two hours, a set of background and test images are taken which results in a minor interruption to the patrol sequence. In addition, once every six hours, images are made in every one of our seven filter bands. The phasing of the all filter image sequence is such that it coincides with multiple filter imaging done by the ESA/NASA SOHO spacecraft's EIT instrument at 0100, 0700, 1300, and 1900UT.

Current Patrol Sequence Images
Order Image
Type
Exposure
(sec)
Filter Gain
(V)
Cadence
(min)
1,5 Flare 0.015 OPEN 500 4
2,6 Coronal Structure 3.000 OPEN 500 4
3 Flare 0.060 PTHN 500 8
4 Active Region 3.000 PTHN 500 8
7 Flare 3.000 PMED 500 8
8 Flare 3.000 BTHN 500 8

A list of past sequences run is available (though it may not yet include the very latest sequences).

Regularly planned interruptions of SXI data are as follows:

Data System:

The latest SXI images continue to be available within minutes of the observation at NOAA/NGDC in browse, FITS, and MPEG formats. The table below shows the fraction of the expected products (based on the instrument image count) that have been produced. The missing products are will periodically be restored and made available at NGDC .
Data Product Generation
Real-Time NGDC Archive
Month Level-0 Level-1 Level-0 Level-1
Jan 99.40% 96.29% 99.71% 96.56%
Feb 97.26% 94.24% 97.27% 97.25%
Mar 99.61% 99.21% 99.63% 99.23%
Apr 99.93% 99.73% 99.94% 99.73%
May 99.92% 99.60% 99.99% 99.66%
Jun 97.78% 97.19% 97.87% 97.28%
Jul 96.91% 96.74% 96.92% 96.75%
Aug 98.78% 98.58% 98.81% 98.60%

We are continuing to work to raise our real-time data availability to our goal of 99.90% on a monthly basis. The approximate times of currently unfilled major 'data voids' are:

Notice will be posted when these gaps in data are filled.


GOES SXI Operational Status (2003-10-31)

*** SXI RETURNS October 28, 2003! ***

The GOES 12 Solar X-ray Imager (SXI) has been reactivated as of 16:30UT on October 28, 2003. The SXI had halted operations since September 2 (0705 UT) after abnormal behaviour was observed in one of its high voltage systems. An Anomaly Review Board (ARB) investigation will be concluding this week. Although several candidate faults have been identified, no 'smoking gun' has been found. However, during the investigation, testing was conducted that led the board to believe that a 'safe' envelope for operations at lower voltages existed. It was considered extremely unlikely that any new understanding of the HV problem would be gained in this final week of the investigation. So, due to the extreme levels of solar activity, the ARB recommended, and NOAA and NASA approved, the reactivation of SXI within certain HV constraints. SXI cadence remains at 1 image per minute. However, the selection of images is somewhat different and all are taken at a gain of 500V. This gain means a reduced response for the instrument thus degrading signal to noise, but not degrading any spatial or temporal qualities of the instrument.

Instrument:

SXI has resumed operation. Due to the recent HV fault SOCC and SWPC will be watching SXI for any anomalous behavior and will act conservatively to pull SXI from service if necessary for problem evaluation.

The current routine patrol sequence will continue indefinitely. It has been changed somewhat from the sequence which ran prior to September 2 to accommodate lower signal levels from the lower gain setting on the detector. The basic SXI sequence, shown in the table below, is repeated every eight minutes. The pairing of short and long exposures in a given filter allow for the creation of extended dynamic range composite images. Approximately once every two hours, a set of background and test images are taken which results in a minor interruption to the patrol sequence. In addition, once every six hours, images are made in every one of our seven filter bands. The phasing of the all filter image sequence is such that it coincides with multiple filter imaging done by the ESA/NASA SOHO spacecraft's EIT instrument at 0100, 0700, 1300, and 1900UT.

Current Patrol Sequence Images
Order Image
Type
Exposure
(sec)
Filter Gain
(V)
Cadence
(min)
1,5 Flare 0.015 OPEN 500 4
2,6 Coronal Structure 3.000 OPEN 500 4
3 Flare 0.060 PTHN 500 8
4 Active Region 3.000 PTHN 500 8
7 Flare 3.000 PMED 500 8
8 Flare 3.000 BTHN 500 8

A list of past sequences run is available (though it may not yet include the very latest sequences).

Regularly planned interruptions of SXI data are as follows:

Data System:

The latest SXI images continue to be available within minutes of the observation at NOAA/NGDC in browse, FITS, and MPEG formats. The table below shows the fraction of the expected products (based on the instrument image count) that have been produced. The missing products are will periodically be restored and made available at NGDC .
Data Product Generation
Real-Time NGDC Archive
Month Level-0 Level-1 Level-0 Level-1
Jan 99.40% 96.29% 99.71% 96.56%
Feb 97.26% 94.24% 97.27% 97.25%
Mar 99.61% 99.21% 99.63% 99.23%
Apr 99.93% 99.73% 99.94% 99.73%
May 99.92% 99.60% 99.99% 99.66%
Jun 97.78% 97.19% 97.87% 97.28%
Jul 96.91% 96.74% 96.92% 96.75%
Aug 98.78% 98.58% 98.81% 98.60%

We are continuing to work to raise our real-time data availability to our goal of 99.90% on a monthly basis. The approximate times of currently unfilled major 'data voids' are:

Notice will be posted when these gaps in data are filled.


SXI RETURNS! (2003-10-28)

2003-10-28

The GOES 12 Solar X-ray Imager (SXI) has been reactivated as of 16:30UT on October 28, 2003. The SXI had halted operations since September 2 (0705 UT) after abnormal behaviour was observed in one of its high voltage systems. An Anomaly Review Board (ARB) investigation will be concluding this week. Although several candidate faults have been identified, no 'smoking gun' has been found. However, during the investigation, testing was conducted that led the board to believe that a 'safe' envelope for operations at lower voltages existed. It was considered extremely unlikely that any new understanding of the HV problem would be gained in this final week of the investigation. So, due to the extreme levels of solar activity, the ARB recommended, and NOAA and NASA approved, the reactivation of SXI within certain HV constraints. SXI cadence remains at 1 image per minute. However, the selection of images is somewhat different and all are taken at a gain of 500V. This gain means a reduced response for the instrument thus degrading signal to noise, but not degrading any spatial or temporal qualities of the instrument. Look for details and updates in the next few days at this site.

2003-10-03

Apologies for the long delay in updating this page. The initial tests completed during the week of 09/02 helped eliminate some general possibilities regarding the SXI fault such as a temperature or time dependency rather than a dependency on the microchannel plate high voltage level. Additional testing showed no gross detector defects evident in dark images. On 09/11 an investigation panel led by NASA Goddard Space Flight Center and the NOAA Satellite Operations Control Center was formally launched. A review of design and test documentation as well as a telemetry review is currently being conducted. Testing of the engineering model hardware and computer modeling of the high voltage circuitry is progressing. A set of carefully controlled, limited imaging tests on the flight instrument have also been conducted. While there are candidate root causes for the anomaly, no clear diagnosis has been made at this time. However, an encouraging sign is that there may be a range of voltages, at and below 500V, in which the SXI may operate normally. While this voltage regime would provide greatly reduced sensitivity, it would still be possible to get useful observations from the SXI.

2003-09-03

Today the SXI operations team attempted to recover full functionality of the SXI by power cycling the instrument. This would reset instrument memory and remove any 'soft' error caused, for example, by a single event upset. The attempt was unsuccessful and indicates a more permanent error or condition.

Subsequent discussions and examination of data have revealed some details of the over current symptoms which we hope will be useful in diagnosing the problem and eventually working around it. However, for the time being, the SXI will not be imaging the Sun.

Plans are to have further discussions of the data and take a conservative approach to gathering more information on the symptom(s). There will likely be periodic testing of the SXI, in a non-solar imaging mode, for the next several days. As further developments become known, they will be posted here.

2003-09-02

At 07:05 UT on Sept. 02, the SXI instrument returned error code #33 indicating that an over-current condition occurred in one of the two high voltage power supplies. It appears that the instrument responded appropriately to this condition by locking the filterwheel, powering off the high voltage systems, and entering safe mode. Images ceased to be taken at this point.

At 12:56 UT, the ground command schedule directed the SXI into diagnostic mode to conduct a routine weekly filter wheel diagnostic test. The instrument returned error code #6 because the filter wheel had not been unlocked.

At 12:58 UT, the ground command schedule directed the SXI into normal imaging mode. Imaging resumed nominally, with the exception that the filter wheel was still locked so that all images were taken with the radiation shield in place.

At 15:33 UT, the SXI was manually commanded into safe mode. SOCC and SWPC reviewed telemetry to confirm the safety of the SXI. Initial analysis suggested that the original over-current condition appeared to be one that has occurred occassionally in the past under certain circumstances and does not endanger the instrument.

A short (22 minute) MCP start-up procedure to initialize high voltage systems was conducted but resulted in an over current condition forcing the instrument into safe mode again. A second attempt at the high voltage initialization was conducted after forcing a watchdog reset in an attempt to reset some of the instrument memory. The result of the second attempt was another over current and transition to safe mode.

It now appears that the over current problem is not the one that had occassionally been seen previously. It appears that when the instrument controller requests a specific MCP high voltage value for an exposure that sometimes a substantially higher voltage is actually provided. This does not occur all times that high voltage is requested. But, it has occurred three times now in a single day.

Tomorrow morning (Sept. 03), Eastern Time, instrument controllers will confer on the next possible diagnostic steps.


GOES SXI Operational Status (2003-08-28)

*** FALL ECLIPSE SEASON BEGINS AUGUST 31st ***

The GOES-12 fall eclipse season will begin on August 31st and end on October 15th. Eclipses will be centered at about 0500UT and will last from about 1000 sec (penumbra to penumbra) at the beginning and end of the season to about 4000 sec during the middle of the season. A table of eclipse times based on a two line element set epoch of 2003, day of year 236.20758501 is available.

During the spring 2003 eclipse season a noticeable pointing error occurred after each eclipse. This problem was attributed to thermal distortions between the SXI and its pointing reference sensor that became rather extreme in Earth's shadow during eclipse. An analysis has shown that the effect can be corrected for using a fit to temperature sensors on the SXI. This correction will deployed operationally part way into the eclipse season after off-line validation is completed.

Instrument:

SXI continues nominal operation. Due to NOAA Satellite Operations Control Center efforts, north-south pointing has been substantially improved since late July. Previously, the SXI N-S pointing had an offset of 128+/-111 arc seconds. The improved value is -68+/-43 arc seconds. This greatly reduces the occassions during which the OPEN filter light leak cannot be adequately corrected.

The current routine patrol sequence will continue indefinitely. The basic SXI sequence, shown in the table below, is repeated every eight minutes. The pairing of short and long exposures in a given filter allow for the creation of extended dynamic range composite images. Approximately once every two hours, a set of background and test images are taken which results in a minor interruption to the patrol sequence. In addition, once every six hours, images are made in every one of our seven filter bands. The phasing of the all filter image sequence is such that it coincides with multiple filter imaging done by the ESA/NASA SOHO spacecraft's EIT instrument at 0100, 0700, 1300, and 1900UT.

Current Patrol Sequence Images
Order Image
Type
Exposure
(sec)
Filter Gain
(V)
Cadence
(min)
1,5 Flare 0.015 OPEN 550 4
2,6 Coronal Structure 3.000 OPEN 550 4
3 Flare 0.025 PMED 600 8
4 Coronal Structure 3.000 PMED 600 8
7 Flare 0.166 BTHN 700 8
8 Active Region 3.000 BTHN 700 8

A list of past sequences run is available (though it may not yet include the very latest sequences).

Regularly planned interruptions of SXI data are as follows:

Data System:

The latest SXI images continue to be available within minutes of the observation at NOAA/NGDC in browse, FITS, and MPEG formats. The table below shows the fraction of the expected products (based on the instrument image count) that have been produced. The missing products are will periodically be restored and made available at NGDC .
Data Product Generation
Real-Time NGDC Archive
Month Level-0 Level-1 Level-0 Level-1
Jan 99.40% 96.29% 99.71% 96.56%
Feb 97.26% 94.24% 97.27% 97.25%
Mar 99.61% 99.21% 99.63% 99.23%
Apr 99.93% 99.73% 99.94% 99.73%
May 99.92% 99.60% 99.99% 99.66%
Jun 97.78% 97.19% 97.87% 97.28%
Jul 96.91% 96.74% 96.92% 96.75%

We had two good months during April and May. However, during June and July we have experienced a couple of problems. One, mostly resolved, was interferencing radio signal at our receiver. The other, with several occurrances has been due to instability in our aging ingest and preprocessing system and its network. A replacement preprocessor will be installed this week or next to address this problem. We continuing to work to raise our real-time data availability to our goal of 99.90% on a monthly basis. The approximate times of currently unfilled major 'data voids' are:

Notice will be posted when these gaps in data are filled.


GOES SXI Operational Status (2003-08-04)

*** SXI OUTAGE NOTIFICATION August 4th ***

GOES-12 SXI will be placed at STANDBY Mode and will not be pointed at the sun due to a XRP slew to the stowed position (@-88.0 deg) scheduled to start at approximately 20:47 GMT on DOY 216 (16:47 ET, August 4, 2003). This is due to the scheduled GOES-12 East/West Maneuver #5.

The XRP will slew back to its nominal position at 22:19 GMT, and be returned to track mode at 22:35 GMT. The SXI will then be returned to IMAGE Mode (approximately 22:35 GMT) to execute ICT #62 beginning with Line 29. The images will be phased into their usual 6-hour period at 01:00 GMT on the following day (21:00 ET on the same day) beginning with ICT #62 Line 1.

Instrument:

SXI continues nominal operation. Occassionally, due to pointing offsets errors, the OPEN filter light leak is still minimally visible. A warning flags such images. NOAA Satellite Operations is continues to improve the pointing.

The current routine patrol sequence will continue indefinitely. The basic SXI sequence, shown in the table below, is repeated every eight minutes. The pairing of short and long exposures in a given filter allow for the creation of extended dynamic range composite images. Approximately once every two hours, a set of background and test images are taken which results in a minor interruption to the patrol sequence. In addition, once every six hours, images are made in every one of our seven filter bands. The phasing of the all filter image sequence is such that it coincides with multiple filter imaging done by the ESA/NASA SOHO spacecraft's EIT instrument at 0100, 0700, 1300, and 1900UT.

Current Patrol Sequence Images
Order Image
Type
Exposure
(sec)
Filter Gain
(V)
Cadence
(min)
1,5 Flare 0.015 OPEN 550 4
2,6 Coronal Structure 3.000 OPEN 550 4
3 Flare 0.025 PMED 600 8
4 Coronal Structure 3.000 PMED 600 8
7 Flare 0.166 BTHN 700 8
8 Active Region 3.000 BTHN 700 8

A list of past sequences run is available (though it may not yet include the very latest sequences).

Regularly planned interruptions of SXI data are as follows:

Data System:

The latest SXI images continue to be available within minutes of the observation at NOAA/NGDC in browse, FITS, and MPEG formats. The table below shows the fraction of the expected products (based on the instrument image count) that have been produced. The missing products are will periodically be restored and made available at NGDC .
Data Product Generation
Real-Time NGDC Archive
Month Level-0 Level-1 Level-0 Level-1
Jan 99.40% 96.29% 99.71% 96.56%
Feb 97.26% 94.24% 97.27% 97.25%
Mar 99.61% 99.21% 99.63% 99.23%
Apr 99.93% 99.73% 99.94% 99.73%
May 99.92% 99.60% 99.99% 99.66%
Jun 97.78% 97.19% 97.87% 97.28%
Jul 96.91% 96.74% 96.92% 96.75%

We had two good months during April and May. However, during June and July we have experienced a couple of problems. One, mostly resolved, was interferencing radio signal at our receiver. The other, with several occurrances has been due to instability in our aging ingest and preprocessing system and its network. A replacement preprocessor will be installed this week or next to address this problem. We continuing to work to raise our real-time data availability to our goal of 99.90% on a monthly basis. The approximate times of currently unfilled major 'data voids' are:

Notice will be posted when these gaps in data are filled.


GOES SXI Operational Status (2003-06-06)

*** SXI OUTAGE NOTIFICATION ***

The GOES-12 SXI will be placed at STANDBY Mode and will not be pointed at the sun due to an XRP slew to the stowed position (@-88.0 deg) scheduled to start at approximately 00:47 GMT on DOY 161, June 10, 2003 (20:47 ET on June 9). This is due to the scheduled GOES-12 E/W #4 Maneuver.

The XRP will slew back to its nominal position at 02:44 GMT, and be returned to track mode approximately at 02:55 GMT. The SXI clock will then be returned to IMAGE Mode (approximately 03:00 GMT) after resetting its clock and doing a FW Diagnostics. SXI will begin executing ICT #62 beginning with Line #13 (The elapsed time between Line #1 and line #13 is exactly 2 hours).

Instrument:

SXI formally began operations on April 26th after a short data outage that coincided with the spacecraft maneuver to stop its eastward drift at 75 deg W longitude. The image processing software has incorporated a correction to the OPEN filter light leak since April 24th. Occassionally, due to pointing errors, the light leak is still minimally visible. A warning flags such images. NOAA Satellite Operations is attempting to improve the pointing. See previous status reports for details about the light leak.

The current routine patrol sequence will continue indefinitely. The basic SXI sequence, shown in the table below, is repeated every eight minutes. The pairing of short and long exposures in a given filter allow for the creation of extended dynamic range composite images. Approximately once every two hours, a set of background and test images are taken which results in a minor interruption to the patrol sequence. In addition, once every six hours, images are made in every one of our seven filter bands. The phasing of the all filter image sequence is such that it coincides with multiple filter imaging done by the ESA/NASA SOHO spacecraft's EIT instrument at 0100, 0700, 1300, and 1900UT.

Current Patrol Sequence Images
Order Image
Type
Exposure
(sec)
Filter Gain
(V)
Cadence
(min)
1,5 Flare 0.015 OPEN 550 4
2,6 Coronal Structure 3.000 OPEN 550 4
3 Flare 0.025 PMED 600 8
4 Coronal Structure 3.000 PMED 600 8
7 Flare 0.166 BTHN 700 8
8 Active Region 3.000 BTHN 700 8

A list of past sequences run is available (though it may not yet include the very latest sequences).

Regularly planned interruptions of SXI data are as follows:

Other upcomming mission events:

Data System:

The latest SXI images continue to be available within minutes of the observation at NOAA/NGDC in browse, FITS, and MPEG formats. The table below shows the fraction of the expected products (based on the instrument image count) that have been produced. The missing products are will periodically be restored and made available at NGDC .
Data Product Generation
Real-Time NGDC Archive
Month Level-0 Level-1 Level-0 Level-1
Jan 99.40% 96.29% 99.71% 96.56%
Feb 97.26% 94.24% 97.27% 97.25%
Mar 99.61% 99.21% 99.63% 99.23%
Apr 99.93% 99.73% 99.94% 99.73%
May 99.92% 99.60% 99.99% 99.66%
Jun
(to date)
99.93% 99.56% 100.00% 99.63%

Since March, there have been no major unplanned data outages for SXI. The unplanned data outages that have occurred since March have been due to unexpected facility power interruptions, network interruptions, and Radio Frequency Interference (RFI). We are currently working these issues to raise our real-time data availability to our goal of 99.90% on a monthly basis. The approximate times of early, currently unfilled 'data voids' are:

Notice will be posted when these gaps in data are filled.


GOES SXI Operational Status (2003-04-24)

Instrument:

We are currently approaching our formal operations date of April 26th which coincides with the spacecraft maneuver to stop its eastward drift at 75 deg W longitude. This maneuver will occur at about 0705UT and SXI will be stowed as a protective measure. So expect an interruption in SXI data for at least an hour around this time. We also intend to introduce an update to our processing software, including a correction to the OPEN filter light leak, prior to April 26th.

The current routine patrol sequence will continue indefinitely. The basic SXI sequence, shown in the table below, is repeated every eight minutes. The pairing of short and long exposures in a given filter allow for the creation of extended dynamic range composite images. Approximately once every two hours, a set of background and test images are taken which results in a minor interruption to the patrol sequence. In addition, once every six hours, images are made in every one of our seven filter bands. The phasing of the all filter image sequence is such that it coincides with multiple filter imaging done by the ESA/NASA SOHO spacecraft's EIT instrument at 0100, 0700, 1300, and 1900UT.

Current Patrol Sequence Images
Order Image
Type
Exposure
(sec)
Filter Gain
(V)
Cadence
(min)
1,5 Flare 0.015 OPEN 550 4
2,6 Coronal Structure 3.000 OPEN 550 4
3 Flare 0.025 PMED 600 8
4 Coronal Structure 3.000 PMED 600 8
7 Flare 0.166 BTHN 700 8
8 Active Region 3.000 BTHN 700 8

A list of past sequences run is available (though it may not yet include the very latest sequences).

Regularly planned interruptions of SXI data are as follows:

Other upcomming mission events:

Data System:

We deployed our light-leak correction algorithm today. The results from testing look very good. Note that even if a correction cannot be performed to the required accuracy, the best possible correction will be done. In this case, a small warning message appears in the PNG browse images and the LONGDARK FITS keyword also contains a similar warning. There are two other modifications to browse (PNG) images for the 3 second exposures. First, when there are saturated pixels due to a flare, those pixels will be replaced with values from the equivalent pixels in the immediately preceeding short exposure image taken with the same filter. Thus, we get rid of the blooming diamonds during flares. Second, we have changed the scaling on the 3 sec PNGs to accomodate seeing some detail in bright flare loops. Both the top and bottom limits have been raised by a factor of four (in linear DN space). Since the PNGs are displayed logarithmically over 3 decades, this equates to ~20% in linear display space. So, there will be a change in the appearance of the images - they look dimmer and more contrasty. It will be most obvious in movies that cover the 'before' and 'after' period.

The latest SXI images continue to be available within minutes of the observation at NOAA/NGDC in browse, FITS, and MPEG formats. The table below shows the fraction of the expected products (based on the instrument image count) that have been produced. The missing products are periodically being restored and made available at NGDC . The ground data system and its configuration management are being updated to reach our operational goal of processing 99.90% (on a monthly basis) of SXI data in real-time to Level-1 by our formal operational date of April 26.
Data Product Generation
Real-Time NGDC Archive
Month Level-0 Level-1 Level-0 Level-1
Jan 99.40% 96.29% 99.71% 96.56%
Feb 97.26% 94.24% 97.27% 97.25%
Mar 99.61% 99.21% 99.63% 99.23%
Apr
(to date)
99.94% 99.72% 99.95% 99.73%

The only substatial real-time data outtage in March was due to a building-wide network outtage. The approximate times of major, currently unfilled 'data voids' are:

Notice will be posted when these gaps in data are filled.


GOES SXI Operational Status (2003-04-08)

Instrument:

Our formal operations date has slipped to April 26th. We have always tied our operational date to the end of the GOES 12 eastward drift. This maneuver was planned for April 22, but orbital mechanics have dictated April 26th is the day.

Tests requiring interruptions in the SXI routine patrol have been completed. Notably, we have obtained good data for X-ray flat fielding thanks to substantial efforts by NOAA/SOCC staff.

The vernal eclipse season for GOES 12 continues. Every day, at around 0600UT, Earth begins passing between the spacecraft and the Sun, providing a unique X-ray sunset. We have noted a pointing anomaly occurring immediately following each eclipse. We believe that this is due to thermal gradients on the instrument causing mechanical strains which then result in offsets between our pointing sensor and the telescope. We hope to model this post-eclipse offset and have it corrected by (ground) software by the autumnal equinox.

We continue to make progress modeling the off-band contamination in the OPEN filter position. We should have a correction on-line by our formal operations date of April 26.

We will begin a new routine patrol sequence on April 12. The main difference between the current and new sequence is the substitution of a few different images every 6 hours. Every six hours, we will now have data taken in every one of our seven filter bands. This should generate data useful to the solar irradiance community and those interested in the differential emission measure of the coronal plasma. The phasing of the image sequence is such that it coincides with multiple filter imaging done by the ESA/NASA SOHO spacecraft's EIT instrument at 0100, 0700, 1300, and 1900UT.

The basic SXI sequence, shown in the table below, is still repeated every eight minutes. The pairing of short and long exposures in a given filter allow for the creation of extended dynamic range composite images. Approximately once every two hours, a set of background and test images are taken which results in a minor interruption to the patrol sequence.

Current Patrol Sequence Images
Order Image
Type
Exposure
(sec)
Filter Gain
(V)
Cadence
(min)
1,5 Flare 0.015 OPEN 550 4
2,6 Coronal Structure 3.000 OPEN 550 4
3 Flare 0.025 PMED 600 8
4 Coronal Structure 3.000 PMED 600 8
7 Flare 0.166 BTHN 700 8
8 Active Region 3.000 BTHN 700 8

A list of past sequences run is available (though it may not yet include the very latest sequences).

Calibration of the GOES 12 X-ray Sensor (XRS) occurs on Wednesdays from about 1834 to 1842 UT. During this period the XRS and the co-aligned SXI are pointed away from the Sun, so no solar images are available.

Data System:
The latest SXI images continue to be available within minutes of the observation at NOAA/NGDC in browse, FITS, and MPEG formats. The table below shows the fraction of the expected products (based on the instrument image count) that have been produced. The missing products are periodically being restored and made available at NGDC . The ground data system and its configuration management are being updated to reach our operational goal of processing 99.90% (on a monthly basis) of SXI data in real-time to Level-1 by our formal operational date of April 26.
Data Product Generation
Real-Time NGDC Archive
Month Level-0 Level-1 Level-0 Level-1
Jan 99.40% 96.29% 99.71% 96.56%
Feb 97.26% 94.24% 97.27% 97.25%
Mar 99.61% 99.21% 99.63% 99.23%
Apr
(to date)
99.96% 99.72% 99.98% 99.75%

The only substatial real-time data outtage in March was due to a building-wide network outtage. The approximate times of major, currently unfilled 'data voids' are:

Notice will be posted when these gaps in data are filled.


GOES SXI Operational Status (2003-03-12)

Instrument:

Although we announced that February 28 would be the last day of routine patrol interruptions for SXI testing, we assessed several other possible tests, including a retry of one that did not work as expected on Feb. 28th. We decided that three more tests (including the retry) should be conducted and will be completed late this week or early next week. After this, there will continue to be occasional, interleaved, individual test images among the routine patrol images.

The vernal eclipse season for GOES 12 continues. Every day, at around 0600UT, Earth begins passing between the spacecraft and the Sun, providing a unique X-ray sunset. We have noted a pointing anomaly occurring immediately following each eclipse. We believe that this is due to thermal gradients on the instrument causing mechanical strains which then result in offsets between our pointing sensor and the telescope. While we have modeled (but not yet operationally applied) thermally driven offsets in pointing for a pseudo steady-state environment, the effect is more dramatic after eclipse. Eclipses will continue until early April. We hope to model this post-eclipse offset and have it corrected by (ground) software by the autumnal equinox.

We continue to make progress modeling the off-band contamination in the OPEN filter position. We should have a correction on-line by our formal operations date of April 22.

The current routine patrol sequence is shown in the table below. The sequence is repeated every eight minutes. The pairing of short and long exposures in a given filter allow for the creation of extended dynamic range composite images. Approximately once an hour, a set of background and test images are taken which results in a minor interruption to the patrol sequence.

Current Patrol Sequence Images
Order Image
Type
Exposure
(sec)
Filter Gain
(V)
Cadence
(min)
1,5 Flare 0.015 OPEN 550 4
2,6 Coronal Structure 3.000 OPEN 550 4
3 Flare 0.025 PMED 600 8
4 Coronal Structure 3.000 PMED 600 8
7 Flare 0.166 BTHN 700 8
8 Active Region 3.000 BTHN 700 8

A list of past sequences run is available (though it may not yet include the very latest sequences).

Calibration of the GOES 12 X-ray Sensor (XRS) occurs on Wednesdays from about 1834 to 1842 UT. During this period the XRS and the co-aligned SXI are pointed away from the Sun, so no solar images are available.

Data System:
The latest SXI images continue to be available within minutes of the observation at NOAA/NGDC in browse, FITS, and MPEG formats. The table below shows the fraction of the expected products (based on the instrument image count) that were produced in real-time. The missing products will be restored and made available at NGDC in the near future. The ground data system and its configuration management are being updated to reach our operational goal of processing 99.90% (on a monthly basis) of SXI data in real-time to Level-1 by our formal operational date of April 22.
Real-Time Data Product Generation
Month Level-0 Level-1
Jan 99.40% 96.29%
Feb 97.26% 94.24%
Mar
(to date)
99.24% 98.69%

The only substatial real-time data outtage in March was due to a building-wide network outtage. The approximate times of major, currently unfilled 'data voids' are:

Notice will be posted when these gaps in data are filled.


GOES SXI Operational Status (2003-02-28)

Instrument:

Today should be the last day of routine patrol interruptions for SXI testing. We will be updating our routine patrol sequence prior to the start of formal operations on April 22. Also, there will continue to be occasional, interleaved, individual test images among the routine patrol images.

We have entered the vernal eclipse season for GOES 12. Every day, at around 0600UT, Earth begins passing between the spacecraft and the Sun, providing a unique X-ray sunset. The first one, shown here, occurred over (under!) the south pole. Eclipses will continue until early April.

Recent testing and analysis has indicated that we mostly understand our off-band light leak in the 'OPEN' filter wheel position. We are optimistic about correcting the contamination in ground processing as we enter operations. The most notable issue with regard to instrument performance is the appearance of an apparent off-band, spatially localized light leak.

The current routine patrol sequence is shown in the table below. The sequence is repeated every eight minutes. The pairing of short and long exposures in a given filter allow for the creation of extended dynamic range composite images. Approximately once an hour, a set of background and test images are taken which results in a minor interruption to the patrol sequence.

Current Patrol Sequence Images
Order Image
Type
Exposure
(sec)
Filter Gain
(V)
Cadence
(min)
1,5 Flare 0.015 OPEN 550 4
2,6 Coronal Structure 3.000 OPEN 550 4
3 Flare 0.025 PMED 600 8
4 Coronal Structure 3.000 PMED 600 8
7 Flare 0.166 BTHN 700 8
8 Active Region 3.000 BTHN 700 8

A list of past sequences run is available (though it may not yet include the very latest sequences).

Calibration of the GOES 12 X-ray Sensor (XRS) occurs on Wednesdays from about 1834 to 1842 UT. During this period the XRS and the co-aligned SXI are pointed away from the Sun, so no solar images are available.

Data System:
The latest SXI images continue to be available within minutes of the observation at NOAA/NGDC in browse, FITS, and MPEG formats. The ground data system has processed more than 96% of SXI data into Level-1 FITS products in real-time. The remaining 4% of data is not lost, it was simply not processed in real-time due to ground data system issues. The data will be restored and made available at NGDC in the near future. The ground data system and its configuration management are being updated to reach our operational goal of processing 99.9% (on a monthly basis) of SXI data in real-time to Level-1.

The approximate times of major, currently unfilled 'data voids' are:

Notice will be posted when these gaps in data are filled.


GOES SXI Operational Status (2003-02-19)

Instrument:
The SXI instrument is spending most of its time conducting routine patrol imaging sequences. However, occasional instrument tests are also being conducted to refine our understanding of instrument performance prior to entering operations on April 22.

The most notable issue with regard to instrument performance is the appearance of an apparent off-band, spatially localized light leak. The leak is evident only in the 'OPEN' filter wheel position. We are continuing tests and are hopeful that a correction for this contaminating source can be implemented into the processing stream by the time we enter operations.

The routine patrol sequence is shown in the table below. The sequence is repeated every eight minutes. The pairing of short and long exposures in a given filter allow for the creation of extended dynamic range composite images. Approximately once an hour, a set of background and test images are taken which results in a minor interruption to the patrol sequence.

Current Patrol Sequence Images
Order Image
Type
Exposure
(sec)
Filter Gain
(V)
Cadence
(min)
1,5 Flare 0.015 OPEN 550 4
2,6 Coronal Structure 3.000 OPEN 550 4
3 Flare 0.025 PMED 600 8
4 Coronal Structure 3.000 PMED 600 8
7 Flare 0.166 BTHN 700 8
8 Active Region 3.000 BTHN 700 8

The current schedule of tests which will interrupt routine patrol imaging is:

These tests typically will start around 1800UT and last for one to several hours. A list of past sequences run is also available (though it may not yet include the very latest sequences).

Finally, note that a calibration of the GOES 12 X-ray Sensor (XRS) occurs on Wednesdays from about 1834 to 1842 UT. During this period the XRS and the co-aligned SXI are pointed away from the Sun, so no solar images are available.

Data System:
The latest SXI images continue to be available within minutes of the observation at NOAA/NGDC in browse, FITS, and MPEG formats. The ground data system has processed more than 96% of SXI data into Level-1 FITS products in real-time. The remaining 4% of data is not lost, it was simply not processed in real-time due to ground data system issues. The data will be restored and made available at NGDC in the near future. The ground data system and its configuration management are being updated to reach our operational goal of processing 99.9% (on a monthly basis) of SXI data in real-time to Level-1.

The approximate times of major, currently unfilled 'data voids' are:

Notice will be posted when these gaps in data are filled.


GOES SXI Operational Status (2003-01-24)

Instrument:
GOES 12, with its Solar X-ray Imager (SXI), is in the process of entering operations as the replacement for the aging GOES 8 spacecraft. SXI began imaging the Sun on January 22 and will continue to do so indefinitely. However, during the next 2-3 weeks, a number of instrument tests and calibrations will be performed. In addition, the spacecraft is currently drifting to its final orbital longitude and SXI pointing may be degraded during that time. Formal operations of the SXI will begin when the spacecraft stops drifting on about April 22.

Data System:
The latest SXI images are available within minutes of the observation as browse files and movies at NOAA/SWPC. All SXI images, including the latest, are available at NOAA/NGDC in both browse and FITS format. NGDC also provides daily MPEG movies of selected SXI data.


GOES SXI Operational Status (2002-07-31)

Instrument:
GOES 12 and SXI have successfully completed Post-Launch Testing (PLT) on December 20, 2001. The spacecraft was then placed in a storage mode as a backup to the currently operational GOES spacecraft. GOES 12 and SXI will become operational when needed as a replacement for either GOES 8 or GOES 10. No new SXI data will be available until that time.

Data System:
SXI data from the Post-Launch Test (PLT) has been reprocessed at NOAA SWPC. It is now available to the public in FITS format at the NGDC Archive. The data include approximately 100,000 routine patrol images of the Sun. With better knowledge of instrument performance, the data product quality has been improved. For more details, see the latest news announcement from June 14, 2002.


GOES SXI Operational Status (2002-07-03)

Instrument:
GOES 12 and SXI successfully completed Post-Launch Testing (PLT) on December 20, 2001. The spacecraft was then placed in a storage mode as a backup to the currently operational GOES spacecraft. GOES 12 and SXI will become operational when needed as a replacement for either GOES 8 or GOES 10. No new SXI data will be available until that time.

Data Reprocessing:
SXI data from the Post-Launch Test (PLT) is currently being reprocessed at NOAA SWPC. With better knowledge of instrument performance, the data product quality will be improved. The data will begin to be released on July 8, 2002. For more details, see the latest news announcement from June 14, 2002. At the current reprocessing speed, we anticipate that all September and October 2001 data will be available in FITS format starting July 8th. November 2001 data should be reprocessed by July 15th and December 2001 data should be reprocessed by July 22nd.


GOES SXI Operational Status (2001-12-20)

SXI STATUS:
GOES 12 and SXI have successfully completed Post-Launch Testing (PLT). The spacecraft has been placed in a storage mode as of 20 December 2001 as a backup to the currently operational GOES spacecraft. GOES 12 and SXI will become operational when needed as a replacement for either GOES 8 or GOES 10. No new SXI data will be available until that time. However, there are plans to release FITS format data from the PLT period by the summer of 2002 when additional instrument performance analysis will have been completed.


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Last update August 24, 2007