[Ips-hf-warning] ASWFC HF DEPRESSION WARNING issued 0034 UT on 05 Oct 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC HF RADIO COMMUNICATIONS WARNING 25/91
ISSUED AT 0033UT/05 OCTOBER 2025
BY THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE.

East coast Australian MUFs have become 20-30% depressed after 
04/2200UT. The cause of this middle latitude ionospheric frequency 
depression is unclear, with the Australian regional geomagnetic 
field at G0 for the past 24 hours.

DEGRADED HF PROPAGATION CONDITIONS EXPECTED
FOR 05 OCTOBER 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
_____________________________________________________________
05 Oct:   80   -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