[Ips-dhfpr] ASWFC Daily HF Prop Report - 05 October 25 issued 2330 UT on 05 Oct 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/05 OCTOBER 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (05 OCTOBER) 
Date   T index  Conditions    
05 Oct    99    Fair           

Flares: none.

MUFs:
   Cocos Island Region:
      Enhanced by 50% during local day.
      Enhanced by 35% during local night.
   Niue Island Region:
      Enhanced by 25% during local day.
      Near predicted monthly values during local night.
      Enhanced by 20% after local dawn.
   Northern Australian Region:
      Near predicted monthly values.
      MUFs at Townsville 15-30% depressed 05/00-03UT.
   Southern Australian Region:
      Depressed by 20% during local day.
      Depressed by 15% during local night.
   Antarctic Region (Casey/Davis/Mawson):
      Near predicted monthly values over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
Sep      109
Oct      89
Nov      89


2. FORECAST (06 OCTOBER - 08 OCTOBER)
Date   T index  Conditions       MUFs                              
06 Oct   105    Fair-normal      Near predicted monthly values
07 Oct   105    Fair-normal      Near predicted monthly values    
08 Oct   105    Normal           Near predicted monthly values   

COMMENT: Maximum usable frequencies (MUFs) in the Australian 
region on UT day 05-Oct were depressed 15-20% in the southern 
Australian region and near predicted monthly values in the northern 
Australian region. The cause of the MUF depression for the middle 
latitude Australian region is unclear, with MUFs gradually recovering 
during the local day. Spread F was observed at Hobart during 
local night hours. MUFs are expected to be near predicted monthly 
values over 06-08 Oct, with mildly degraded conditions during 
local night hours for the southern Australian region.

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For an explanation of some of the terms in this report, go to
https://www.sws.bom.gov.au, and follow links to Educational->
Glossary on Solar Terrestrial Terms.

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