[Ips-hf-warning] ASWFC HF DEPRESSION WARNING issued 2104 UT on 12 Dec 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC HF RADIO COMMUNICATIONS WARNING 25/121
ISSUED AT 2104UT/12 DECEMBER 2025
BY THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE.

Australian regional MUFs are 15-30% depressed after local dawn this 
morning following overnight G1 geomagnetic activity.

DEGRADED HF PROPAGATION CONDITIONS EXPECTED
FOR 13 DECEMBER 2025
IF COMMS DIFFICULTIES EXPERIENCED TRY A LOWER FREQUENCY BAND
_____________________________________________________________

HF COMMUNICATIONS FORECAST (AUSTRALIAN/NEW ZEALAND REGION)
                                   FREQUENCY BANDS
       T-index      MUFs        2  4  6  8 12 16 22 26
_____________________________________________________________
13 Dec:   65   -20%/normal      2  4  6  8  8 12 16 16

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