NOAA / Space Weather Prediction Center

Solar Activity

Three-day X-Ray Forecast
Product Description:
Daily probabilities of X-class and M-class flares over the next one, two, and three days.

Target Users: Product users include industries that rely on HF Communication, such as: emergency managers, aviation, and maritime communication.

Three-day X-Ray Forecast
Cadence: Daily
Data Source: Solar images and GOES X-Rays

Three-day Proton Forecast
Product Description:
Daily probabilities of solar proton events over the next one, two, and three days. A solar proton event is defined by the >10 MeV proton flux exceeding 10 particles/(cm2 s sr) at geostationary orbit.

Target Users: Product users include industries that rely on HF Communication, particularly at high latitudes, the satellite industry and activities sensitive to energetic particle radiation at high altitudes and in space.

Three-day Proton Event Forecast
Cadence: Daily
Data Source: Solar Images, GOES X-Ray and Proton measurements

Current X-Ray and Proton Alerts
Product Description:
Timeline of currently active and recent X-Ray and energetic proton alerts. Alerts are issued when observed X-Ray and proton flux levels at geostationary orbit exceed predetermined thresholds.

Target Users: Product users include industries that rely on HF Communication, the satellite industry and activities sensitive to energetic particle radiation at high altitudes and in space.

Current X-Ray and Proton Alerts
Cadence: As Issued
Data Source: GOES X-Ray and Proton measurements