📡 D-Region Absorption Predictions
Real-time ionospheric D-region absorption forecasts from NOAA SWPC. Monitor HF radio communication impacts from solar activity.
Global D-Region Absorption (1 dB threshold)
Animated forecast showing areas experiencing 1 dB or greater absorption worldwide.
What is D-RAP?
D-Region Absorption Predictions show ionospheric D-layer (60-90 km altitude) absorption affecting HF radio (3-30 MHz) communications.
Solar Impact
Solar X-ray flares and energetic particles increase D-region ionization, causing radio blackouts within minutes. Effects can last hours to days.
Critical Users
Aviation (transpolar routes), emergency services, maritime, military, and amateur radio operators rely on D-RAP for communications planning.