[Ips-hf-warning] ASWFC HF DEPRESSION WARNING issued 0441 UT on 29 Oct 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC HF RADIO COMMUNICATIONS WARNING 25/97
ISSUED AT 0441UT/29 OCTOBER 2025
BY THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE.

Fof2 values have been depressed by over 15% in the southern Australian 
region in the first hours of 29-Oct UT day. Likely due to coronal 
hole high speed wind stream effects.

DEGRADED HF PROPAGATION CONDITIONS EXPECTED
FOR 29 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
_____________________________________________________________
29 Oct:   50          -16%      2  4  6  8 12 12 16 22

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