[Ips-hf-warning] ASWFC HF DEPRESSION WARNING issued 0218 UT on 02 Oct 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC HF RADIO COMMUNICATIONS WARNING 25/89
ISSUED AT 0214UT/02 OCTOBER 2025
BY THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE.

Widespread HF depressions have been observed across the world 
on UT day 1-Oct. In particular, the Australian region has observed 
depressions to maximum usable frequencies (MUFs) up to 30%. Similar 
MUF depressions are likely on 2-Oct, worsening over 3-4 Oct due 
to coronal hole effects.

DEGRADED HF PROPAGATION CONDITIONS EXPECTED
FROM 02-04 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
_____________________________________________________________
02 Oct:  100   normal/-30%      2  4  6  6  8 12 16 16
03 Oct:   95   normal/-30%      2  4  6  6  8 12 16 16
04 Oct:   90   normal/-30%      2  4  6  6  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