[Ips-hf-warning] ASWFC HF DEPRESSION WARNING issued 2238 UT on 17 Dec 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC HF RADIO COMMUNICATIONS WARNING 25/123
ISSUED AT 2237UT/17 DECEMBER 2025
BY THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE.

Australian regional MUFs are expected to be 15-20% depressed 
on 18-Dec. MUFs are expected to gradually recover to near predicted 
monthly values.

DEGRADED HF PROPAGATION CONDITIONS EXPECTED
FOR 18 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
_____________________________________________________________
18 Dec:   60   -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