[Ips-hf-warning] ASWFC HF SHORTWAVE FADEOUT WARNING issued 0440 UT on 12 Jul 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC HF RADIO COMMUNICATIONS WARNING 25/71
ISSUED AT 0437UT/12 JULY 2025
BY THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE.

Solar region AR4140 located in the southeast solar quadrant has 
produced a R1-Minor flare at 12/0402UT. In addition, small solar 
region AR4138 in the northwest solar quadrant is rapidly growing. 
Further low ASWAS R level flare activity is expected, with isolated 
fadeouts impacting lower HF frequencies.

DEGRADED HF PROPAGATION CONDITIONS EXPECTED
FROM 12-14 JULY 2025 
IF COMMS DIFFICULTIES EXPERIENCED TRY A HIGHER FREQUENCY BAND
_____________________________________________________________

SOLAR ACTIVITY FORECAST       HF COMMS FADEOUTS
12 Jul:  R1,chance R2         Possible
13 Jul:  R1,chance R2         Possible
14 Jul:  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