HF Fadeout Warning

(last updated 28 Aug 2025 15:55 UT)
SUBJ: ASWFC HF RADIO COMMUNICATIONS WARNING 25/77 ISSUED AT 0115UT/27 AUGUST 2025 BY THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE. AR4197 and AR4199 have continued to consistently produce R1 level flares. Shortwave fadeouts are probable. DEGRADED HF PROPAGATION CONDITIONS EXPECTED FROM 27-29 AUGUST 2025 IF COMMS DIFFICULTIES EXPERIENCED TRY A HIGHER FREQUENCY BAND _____________________________________________________________ SOLAR ACTIVITY FORECAST HF COMMS FADEOUTS 27 Aug: R1-R2 Probable 28 Aug: R1-R2 Probable 29 Aug: R1-R2 Probable