NOAA / Space Weather Prediction Center

HF Communications

Global D-Region Absorbtion
Product Description:
2-D product showing current location and intensity of expected degradation of High Frequency radio communication. Information is provided for all latitudes and within specific frequency bands. At low latitudes, the radio communication degradation is due to solar x-rays. At high latitudes, the degradation is due to solar energetic particles. Product gives current communication disturbance levels and expected duration.

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

Global D-Region Absorbtion
Cadence: 1-min
Data Source: GOES X-ray and GOES Proton measurements

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. For current HF Communication conditions, see the Global D-Region Absorption product

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. For current HF Communication conditions, see the Global D-Region Absorption product.

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. For current HF Communication conditions, see the Global D-Region Absorption product.

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