[Ips-hf-warning] ASWFC HF DEPRESSION WARNING issued 2300 UT on 06 Dec 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC PRELIMINARY HF RADIO COMMUNICATIONS WARNING 25/117
ISSUED AT 2300UT/06 DECEMBER 2025
BY THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE.

Due to anticipated geomagnetic activity, HF radio propagation 
conditions are expected to become degraded on 9-Dec. Maximum 
usable frequencies in the Australian region are expected to become 
20% depressed over 9-10 Dec.

DEGRADED HF PROPAGATION CONDITIONS EXPECTED
FROM 09-10 DECEMBER 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