[Ips-dhfpr] ASWFC Daily HF Prop Report - 08 October 25 issued 2330 UT on 08 Oct 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/08 OCTOBER 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (08 OCTOBER) 
Date   T index  Conditions    
08 Oct   113    Fair-normal    

Flares: none.

MUFs:
   Cocos Island Region:
      Enhanced by 25% during local day.
      Near predicted monthly values during local night.
   Niue Island Region:
      Enhanced by 25% during local day.
      Enhanced by 15% during local night.
   Northern Australian Region:
      Enhanced by 15% during local day.
      Near predicted monthly values during local night.
   Southern Australian Region:
      Near predicted monthly values.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 15% over the UT day.

PCA Event : No event.

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


2. FORECAST (09 OCTOBER - 11 OCTOBER)
Date   T index  Conditions       MUFs                              
09 Oct   100    Normal           Near predicted monthly values 
                                 to 15% enhanced
10 Oct   100    Normal           Near predicted monthly values 
                                 to 15% enhanced    
11 Oct   100    Normal-fair      Near predicted monthly values 
                                 to 15% enhanced   

COMMENT: Maximum usable frequencies (MUFs) in the Australian 
region on UT day 08-Oct were near predicted values to 15% enhanced. 
Spread-F was observed at Hobart and Canberra during local night 
hours. MUFS at Hobart and Norfolk Island were 15-20% depressed 
after local dawn which are not expected to persist. MUFs are 
expected to be mostly near predicted values to 15% enhanced over 
9-11 Oct. Southern Australian region HF conditions may become 
degraded late in the UT day on 11-Oct in association with coronal 
hole wind stream induced geomagnetic activity.

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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