Space Weather for Aviation Service Providers
NOAA National Weather Service Space Weather Prediction Center

24 hour Forecast issued Apr 25 0600 UTC, Geophysical Alert Message

Solar-terrestrial indices for 24 April follow.
Solar flux 130 and estimated planetary A-index 10.
The estimated planetary K-index at 0600 UTC on 25 April was 3.

Space weather for the past 24 hours has been strong.
Radio blackouts reaching the R3 level occurred.

No space weather storms are predicted for the next 24 hours.

Latest 3-day Solar Weather Forecast

NOAA Scale
Geomagnetic Storms
Solar Radiation Storms
Radio Blackouts

POES Auroral Activity Estimate
Latest POES auroral activity estimate
Effects: HF Radio propagation, Aurora boundaries
SDO - HMI Intensitygram
Latest SDO - HMI Intensitygram
Image courtesy NASA SDO
Global D-Region Absorption Prediction
Latest Global D-Region Absorption Prediction map
Effects: HF Radio communications

Estimated Planetary K-index
Latest Estimated Planetary Kp plot
Effects: HF Radio propagation
GOES-15 Proton Flux
Latest GOES Proton plot
Effects: HF Radio communications,
Indicator of radiation risk
GOES X-ray Flux
Latest GOES Xray Flux plot
Effects: HF Radio communications

Space Weather Alerts of interest to Aviation users, issued in past 24 hours
Issue Time Type Details
Apr 25 0048 UTC SUMMARY: X-ray Event exceeded X1 Begin Time: 2014 Apr 25 0017 UTC
Maximum Time: 2014 Apr 25 0027 UTC
End Time: 2014 Apr 25 0038 UTC
X-ray Class: X1.3
Location: S14W90
NOAA Scale: R3 - Strong
Potential Impacts: Area of impact consists of large portions of the sunlit side of Earth, strongest at the sub-solar point.
Radio - Wide area blackout of HF (high frequency) radio communication for about an hour.
Apr 25 0024 UTC ALERT: X-Ray Flux exceeded M5 Threshold Reached: 2014 Apr 25 0022 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

Last page update 2014 Apr 25 0813 UTC. This page automatically reloads every minute but not all displays are created at that rate. See User Guide for individual display update rates. Note: use browser Reload when returning to this page to ensure latest data.

The Space Weather Prediction Center (SWPC) Space Weather for Aviation Service Providers web site is designed for the aviation community to communicate space weather information in terms that are easy to interpret and understand. Solar events can have a detrimental impact on airlines and ground equipment. Space weather storms can result in lost or degraded communications, unreliable navigational equipment, flight-critical electronic system problems, and radiation hazards to crew and passengers.

Displays show the most recent data available at SWPC. See the sample web page which shows how the page looked during the high solar activity in September 2005. See Data and Products for earlier data.

The Space Weather for Aviation Service Providers web page is described in its Product Description Document. The Feedback Form can be used for comments, questions and suggestions.

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