[Ips-hf-warning] ASWFC HF DEPRESSION WARNING issued 0155 UT on 12 Sep 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC PRELIMINARY HF RADIO COMMUNICATIONS WARNING 25/83
ISSUED AT 0153UT/12 SEPTEMBER 2025
BY THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE.

Southern Australian region MUFs may become depressed by 15-20% 
during the period 15-16 Sep due to anticipated geomagnetic activity 
induced by a coronal hole high speed wind stream.

DEGRADED HF PROPAGATION CONDITIONS EXPECTED
FROM 15-16 SEPTEMBER 2025
IF COMMS DIFFICULTIES EXPERIENCED TRY A LOWER FREQUENCY BAND
A MORE DETAILED HF WARNING WILL FOLLOW IF DEPRESSIONS EVENTUATE.
_____________________________________________________________

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