[Ips-hf-warning] ASWFC HF SHORTWAVE FADEOUT WARNING issued 0719 UT on 25 Jun 2026 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC HF RADIO COMMUNICATIONS WARNING 26/56
ISSUED AT 0718UT/25 JUNE 2026
BY THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE.

New sunspot region AR 4478 is showing high magnetic complexity. 
While it has yet to produce any significant solar flares that 
would cause a shortwave fadeout to HF frequencies, it does show 
high potential to do so. Chance for shortwave fadeouts may be 
R0-R1 with a chance for R2 in the coming days.

DEGRADED HF PROPAGATION CONDITIONS EXPECTED
FROM 25-26 JUNE 2026
IF COMMS DIFFICULTIES EXPERIENCED TRY A HIGHER FREQUENCY BAND
_____________________________________________________________

SOLAR ACTIVITY FORECAST       HF COMMS FADEOUTS
25 Jun:  R0-R1, chance R2      Possible
26 Jun:  R0-R1, chance R2      Possible

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