[Ips-hf-warning] ASWFC HF SHORTWAVE FADEOUT WARNING issued 2040 UT on 20 Aug 2026 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC HF RADIO COMMUNICATIONS WARNING 26/75
ISSUED AT 2038UT/20 AUGUST 2026
BY THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE.

Active Region (AR) 4513 recently rotated over the eastern limb 
and produced a flare at the R2 level. Shortwave fadeouts are 
probable.

DEGRADED HF PROPAGATION CONDITIONS EXPECTED
FROM 20-22 AUGUST 2026
IF COMMS DIFFICULTIES EXPERIENCED TRY A HIGHER FREQUENCY BAND
_____________________________________________________________

SOLAR ACTIVITY FORECAST       HF COMMS FADEOUTS
20 Aug:  R1-R2                    Probable
21 Aug:  R1-R2                    Probable
22 Aug:  R1-R2                    Probable

Australian Space Weather Forecasting Centre
Bureau of Meteorology
ASWFC at bom.gov.au
www.bom.gov.au | www.sws.bom.gov.au