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Alerts Issued in April 2013


Space Weather Message Code: ALTEF3
Serial Number: 2010
Issue Time: 2013 Apr 30 1201 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2009
Begin Time: 2013 Apr 27 0915 UTC
Yesterday Maximum 2MeV Flux: 1592 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.


Space Weather Message Code: ALTTP4
Serial Number: 410
Issue Time: 2013 Apr 29 2001 UTC

ALERT: Type IV Radio Emission
Begin Time: 2013 Apr 29 1943 UTC
Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms.


Space Weather Message Code: ALTTP2
Serial Number: 847
Issue Time: 2013 Apr 29 1950 UTC

ALERT: Type II Radio Emission
Begin Time: 2013 Apr 29 1935 UTC
Estimated Velocity: 824 km/s
Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.


Space Weather Message Code: ALTEF3
Serial Number: 2009
Issue Time: 2013 Apr 29 1240 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2008
Begin Time: 2013 Apr 27 0915 UTC
Yesterday Maximum 2MeV Flux: 2698 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.


Space Weather Message Code: ALTTP4
Serial Number: 409
Issue Time: 2013 Apr 28 2101 UTC

ALERT: Type IV Radio Emission
Begin Time: 2013 Apr 28 2027 UTC
Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms.


Space Weather Message Code: ALTTP2
Serial Number: 846
Issue Time: 2013 Apr 28 2101 UTC

ALERT: Type II Radio Emission
Begin Time: 2013 Apr 28 2018 UTC
Estimated Velocity: 576 km/s
Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.


Space Weather Message Code: ALTEF3
Serial Number: 2008
Issue Time: 2013 Apr 28 0755 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2007
Begin Time: 2013 Apr 27 0915 UTC
Yesterday Maximum 2MeV Flux: 2922 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.


Space Weather Message Code: ALTEF3
Serial Number: 2007
Issue Time: 2013 Apr 27 0936 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2013 Apr 27 0915 UTC
Station: GOES13
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.


Space Weather Message Code: ALTK05
Serial Number: 713
Issue Time: 2013 Apr 26 0601 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2013 Apr 26 0559 UTC
Synoptic Period: 0300-0600 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.


Space Weather Message Code: WARK05
Serial Number: 832
Issue Time: 2013 Apr 26 0520 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2013 Apr 26 0518 UTC
Valid To: 2013 Apr 26 0900 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.


Space Weather Message Code: ALTK04
Serial Number: 1634
Issue Time: 2013 Apr 26 0439 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2013 Apr 26 0435 UTC
Synoptic Period: 0300-0600 UTC
Active Warning: Yes
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.


Space Weather Message Code: WARK04
Serial Number: 2072
Issue Time: 2013 Apr 26 0306 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2013 Apr 26 0310 UTC
Valid To: 2013 Apr 26 1200 UTC
Warning Condition: Onset
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.


Space Weather Message Code: WARK04
Serial Number: 2071
Issue Time: 2013 Apr 24 2057 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 2070
Valid From: 2013 Apr 24 0145 UTC
Now Valid Until: 2013 Apr 25 1500 UTC
Warning Condition: Persistence
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.


Space Weather Message Code: WARK05
Serial Number: 831
Issue Time: 2013 Apr 24 2045 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 830
Valid From: 2013 Apr 24 1445 UTC
Now Valid Until: 2013 Apr 25 0900 UTC
Warning Condition: Persistence

Comment: Favorable conditions for a K-index of 5 persist.
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.


Space Weather Message Code: WARK04
Serial Number: 2070
Issue Time: 2013 Apr 24 1444 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 2069
Valid From: 2013 Apr 24 0145 UTC
Now Valid Until: 2013 Apr 25 0000 UTC
Warning Condition: Persistence
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.


Space Weather Message Code: WARK05
Serial Number: 830
Issue Time: 2013 Apr 24 1442 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2013 Apr 24 1445 UTC
Valid To: 2013 Apr 24 2100 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.


Space Weather Message Code: ALTTP2
Serial Number: 845
Issue Time: 2013 Apr 24 1309 UTC

ALERT: Type II Radio Emission
Begin Time: 2013 Apr 24 1229 UTC
Estimated Velocity: 788 km/s
Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.


Space Weather Message Code: ALTK04
Serial Number: 1633
Issue Time: 2013 Apr 24 0204 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2013 Apr 24 0202 UTC
Synoptic Period: 0000-0300 UTC
Active Warning: Yes
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.


Space Weather Message Code: WARK04
Serial Number: 2069
Issue Time: 2013 Apr 24 0135 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2013 Apr 24 0145 UTC
Valid To: 2013 Apr 24 1600 UTC
Warning Condition: Onset
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.


Space Weather Message Code: ALTTP2
Serial Number: 844
Issue Time: 2013 Apr 23 1920 UTC

ALERT: Type II Radio Emission
Begin Time: 2013 Apr 23 1823 UTC
Estimated Velocity: 820 km/s
Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.


Space Weather Message Code: ALTTP4
Serial Number: 408
Issue Time: 2013 Apr 23 1711 UTC

ALERT: Type IV Radio Emission
Begin Time: 2013 Apr 23 1646 UTC
Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms.


Space Weather Message Code: ALTTP2
Serial Number: 843
Issue Time: 2013 Apr 23 1439 UTC

ALERT: Type II Radio Emission
Begin Time: 2013 Apr 23 1419 UTC
Estimated Velocity: 1159 km/s
Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.


Space Weather Message Code: WATA20
Serial Number: 520
Issue Time: 2013 Apr 22 2346 UTC

WATCH: Geomagnetic Storm Category G1 Predicted
Highest Storm Level Predicted by Day:
Apr 23: None (Below G1) Apr 24: None (Below G1) Apr 25: G1 (Minor)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.


Space Weather Message Code: ALTTP4
Serial Number: 407
Issue Time: 2013 Apr 22 1748 UTC

ALERT: Type IV Radio Emission
Begin Time: 2013 Apr 22 1728 UTC
Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms.


Space Weather Message Code: ALTTP4
Serial Number: 406
Issue Time: 2013 Apr 22 1453 UTC

ALERT: Type IV Radio Emission
Begin Time: 2013 Apr 22 1035 UTC

Comment: Begin time uncertain.
Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms.


Space Weather Message Code: ALTTP2
Serial Number: 842
Issue Time: 2013 Apr 18 1852 UTC

ALERT: Type II Radio Emission
Begin Time: 2013 Apr 18 1823 UTC
Estimated Velocity: 1273 km/s
Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.


Space Weather Message Code: WATA30
Serial Number: 104
Issue Time: 2013 Apr 14 1333 UTC

CANCEL WATCH: Geomagnetic Storm Category G2 Predicted
Cancel Serial Number: 103
Original Issue Time: 2013 Apr 11 2115 UTC

Comment: G2 conditions are no longer expected. This watch is superseded by G1 watch number 519 issued on 14 April 2013 at 1318 UTC.
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.


Space Weather Message Code: WATA20
Serial Number: 519
Issue Time: 2013 Apr 14 1318 UTC

WATCH: Geomagnetic Storm Category G1 Predicted
Highest Storm Level Predicted by Day:
Apr 14: G1 (Minor) Apr 15: None (Below G1) Apr 16: None (Below G1)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.


Space Weather Message Code: SUMSUD
Serial Number: 170
Issue Time: 2013 Apr 13 2303 UTC

SUMMARY: Geomagnetic Sudden Impulse
Observed: 2013 Apr 13 2255 UTC
Deviation: 29 nT
Station: Boulder


Space Weather Message Code: WARK04
Serial Number: 2068
Issue Time: 2013 Apr 13 2230 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2013 Apr 13 2245 UTC
Valid To: 2013 Apr 14 1900 UTC
Warning Condition: Onset
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.


Space Weather Message Code: WARSUD
Serial Number: 128
Issue Time: 2013 Apr 13 2227 UTC

WARNING: Geomagnetic Sudden Impulse expected
Valid From: 2013 Apr 13 2245 UTC
Valid To: 2013 Apr 13 2359 UTC
IP Shock Passage Observed: 2013 Apr 13 2215 UTC


Space Weather Message Code: SUMPX1
Serial Number: 66
Issue Time: 2013 Apr 13 1546 UTC

SUMMARY: Proton Event 10MeV Integral Flux exceeded 10pfu
Begin Time: 2013 Apr 11 1055 UTC
Maximum Time: 2013 Apr 11 1645 UTC
End Time: 2013 Apr 12 2210 UTC
Maximum 10MeV Flux: 114 pfu
NOAA Scale: S2 - Moderate

Comment: Current flux readings remain enhanced, but have been below the S1 level (10pfu) since 12/2210 UTC.


Space Weather Message Code: SUMPX2
Serial Number: 33
Issue Time: 2013 Apr 12 0019 UTC

SUMMARY: Proton Event 10MeV Integral Flux exceeded 100pfu
Begin Time: 2013 Apr 11 1630 UTC
Maximum Time: 2013 Apr 11 1645 UTC
End Time: 2013 Apr 11 1705 UTC
Maximum 10MeV Flux: 114 pfu
NOAA Scale: S2 - Moderate


Space Weather Message Code: SUMPC0
Serial Number: 23
Issue Time: 2013 Apr 12 0019 UTC

SUMMARY: Proton Event 100MeV Integral Flux exceeded 1pfu
Begin Time: 2013 Apr 11 0940 UTC
Maximum Time: 2013 Apr 11 1400 UTC
End Time: 2013 Apr 11 1955 UTC
Maximum 100MeV Flux: 2 pfu


Space Weather Message Code: WARPX1
Serial Number: 391
Issue Time: 2013 Apr 12 0019 UTC

EXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expected
Extension to Serial Number: 390
Valid From: 2013 Apr 11 0915 UTC
Now Valid Until: 2013 Apr 12 2200 UTC
Warning Condition: Persistence
Predicted NOAA Scale: S1 - Minor
Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.


Space Weather Message Code: WATA30
Serial Number: 103
Issue Time: 2013 Apr 11 2115 UTC

WATCH: Geomagnetic Storm Category G2 Predicted
Highest Storm Level Predicted by Day:
Apr 12: None (Below G1) Apr 13: G2 (Moderate) Apr 14: G2 (Moderate)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.


Space Weather Message Code: WARPX1
Serial Number: 390
Issue Time: 2013 Apr 11 1649 UTC

EXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expected
Extension to Serial Number: 389
Valid From: 2013 Apr 11 0915 UTC
Now Valid Until: 2013 Apr 12 1100 UTC
Warning Condition: Persistence
Predicted NOAA Scale: S2 - Moderate
Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.


Space Weather Message Code: ALTPX2
Serial Number: 52
Issue Time: 2013 Apr 11 1649 UTC

ALERT: Proton Event 10MeV Integral Flux exceeded 100pfu
Begin Time: 2013 Apr 11 1630 UTC
NOAA Scale: S2 - Moderate
Potential Impacts: Radiation - Passengers and crew in high latitude, high altitude flights may experience small, increased radiation exposures.
Spacecraft - Infrequent single-event upsets to satellites are possible.
Radio - Small effects on polar HF (high frequency) propagation resulting in fades at lower frequencies.


Space Weather Message Code: WATA30
Serial Number: 102
Issue Time: 2013 Apr 11 1403 UTC

WATCH: Geomagnetic Storm Category G2 Predicted
Highest Storm Level Predicted by Day:
Apr 11: None (Below G1) Apr 12: None (Below G1) Apr 13: G2 (Moderate)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.


Space Weather Message Code: WARPC0
Serial Number: 67
Issue Time: 2013 Apr 11 1403 UTC

EXTENDED WARNING: Proton 100MeV Integral Flux above 1pfu expected
Extension to Serial Number: 66
Valid From: 2013 Apr 11 0935 UTC
Now Valid Until: 2013 Apr 11 2100 UTC
Warning Condition: Persistence
Potential Impacts: An enhancement in the energetic portion of the solar radiation spectrum may indicate increased biological risk to astronauts or passengers and crew in high latitude, high altitude flights. Additionally, energetic particles may represent an increased risk to all satellite systems susceptible to single event effects. This information should be used in conjunction with the current Solar Radiation Storm conditions when assessing overall impact.


Space Weather Message Code: WARPX1
Serial Number: 389
Issue Time: 2013 Apr 11 1403 UTC

EXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expected
Extension to Serial Number: 388
Valid From: 2013 Apr 11 0915 UTC
Now Valid Until: 2013 Apr 12 0600 UTC
Warning Condition: Persistence
Predicted NOAA Scale: S1 - Minor
Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.


Space Weather Message Code: ALTPX1
Serial Number: 299
Issue Time: 2013 Apr 11 1114 UTC

ALERT: Proton Event 10MeV Integral Flux exceeded 10pfu
Begin Time: 2013 Apr 11 1055 UTC
NOAA Scale: S1 - Minor
Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.


Space Weather Message Code: ALTPC0
Serial Number: 38
Issue Time: 2013 Apr 11 1003 UTC

ALERT: Proton Event 100MeV Integral Flux exceeded 1pfu
Begin Time: 2013 Apr 11 0940 UTC
Potential Impacts: An enhancement in the energetic portion of the solar radiation spectrum may indicate increased biological risk to astronauts or passengers and crew in high latitude, high altitude flights. Additionally, energetic particles may represent an increased risk to all satellite systems susceptible to single event effects. This information should be used in conjunction with the current Solar Radiation Storm conditions when assessing overall impact.


Space Weather Message Code: SUM10R
Serial Number: 574
Issue Time: 2013 Apr 11 0937 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2013 Apr 11 0658 UTC
Maximum Time: 2013 Apr 11 0702 UTC
End Time: 2013 Apr 11 0718 UTC
Duration: 20 minutes
Peak Flux: 470 sfu
Latest Penticton Noon Flux: 148 sfu
Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.


Space Weather Message Code: WARPC0
Serial Number: 66
Issue Time: 2013 Apr 11 0932 UTC

WARNING: Proton 100MeV Integral Flux above 1pfu expected
Valid From: 2013 Apr 11 0935 UTC
Valid To: 2013 Apr 11 1500 UTC
Warning Condition: Onset
Potential Impacts: An enhancement in the energetic portion of the solar radiation spectrum may indicate increased biological risk to astronauts or passengers and crew in high latitude, high altitude flights. Additionally, energetic particles may represent an increased risk to all satellite systems susceptible to single event effects. This information should be used in conjunction with the current Solar Radiation Storm conditions when assessing overall impact.


Space Weather Message Code: WARPX1
Serial Number: 388
Issue Time: 2013 Apr 11 0857 UTC

WARNING: Proton 10MeV Integral Flux above 10pfu expected
Valid From: 2013 Apr 11 0915 UTC
Valid To: 2013 Apr 11 1500 UTC
Warning Condition: Onset
Predicted NOAA Scale: S1 - Minor
Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.


Space Weather Message Code: SUMXM5
Serial Number: 101
Issue Time: 2013 Apr 11 0735 UTC

SUMMARY: X-ray Event exceeded M5
Begin Time: 2013 Apr 11 0655 UTC
Maximum Time: 2013 Apr 11 0716 UTC
End Time: 2013 Apr 11 0729 UTC
X-ray Class: M6.5
Optical Class: 2b
Location: N09E15
NOAA Scale: R2 - Moderate
Potential Impacts: Area of impact centered primarily on sub-solar point on the sunlit side of Earth.
Radio - Limited blackout of HF (high frequency) radio communication for tens of minutes.


Space Weather Message Code: ALTTP2
Serial Number: 841
Issue Time: 2013 Apr 11 0735 UTC

ALERT: Type II Radio Emission
Begin Time: 2013 Apr 11 0702 UTC
Estimated Velocity: 1370 km/s
Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.


Space Weather Message Code: ALTTP4
Serial Number: 405
Issue Time: 2013 Apr 11 0735 UTC

ALERT: Type IV Radio Emission
Begin Time: 2013 Apr 11 0702 UTC
Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms.


Space Weather Message Code: ALTXMF
Serial Number: 185
Issue Time: 2013 Apr 11 0711 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2013 Apr 11 0711 UTC
NOAA Scale: R2 - Moderate
Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/drap/index.html.


Space Weather Message Code: ALTEF3
Serial Number: 2006
Issue Time: 2013 Apr 05 1031 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2005
Begin Time: 2013 Mar 30 1335 UTC
Yesterday Maximum 2MeV Flux: 1653 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.


Space Weather Message Code: ALTEF3
Serial Number: 2005
Issue Time: 2013 Apr 04 0502 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2004
Begin Time: 2013 Mar 30 1335 UTC
Yesterday Maximum 2MeV Flux: 3798 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.


Space Weather Message Code: ALTEF3
Serial Number: 2004
Issue Time: 2013 Apr 03 0500 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2003
Begin Time: 2013 Mar 30 1335 UTC
Yesterday Maximum 2MeV Flux: 5167 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.


Space Weather Message Code: ALTEF3
Serial Number: 2003
Issue Time: 2013 Apr 02 0507 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2002
Begin Time: 2013 Mar 30 1335 UTC
Yesterday Maximum 2MeV Flux: 3309 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.


Space Weather Message Code: ALTEF3
Serial Number: 2002
Issue Time: 2013 Apr 01 0606 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2001
Begin Time: 2013 Mar 30 1335 UTC
Yesterday Maximum 2MeV Flux: 3677 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.