[Ips-dhfpr] ASWFC Daily HF Prop Report - 28 October 25 issued 2330 UT on 28 Oct 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/28 OCTOBER 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (28 OCTOBER) 
Date   T index  Conditions    
28 Oct   113    Normal         

Flares: none.

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Enhanced by 20% during local night.
   Niue Island Region:
      Near predicted monthly values during local day.
      Enhanced by 15% during local night.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian Region:
      Enhanced by 15% during local day.
      Near predicted monthly values during local night.
      Depressed by 20% after local dawn.
   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 (29 OCTOBER - 31 OCTOBER)
Date   T index  Conditions       MUFs                              
29 Oct    90    Fair-normal      Near predicted monthly values/depressed 
                                 5 to 15%
30 Oct    75    Fair             Near predicted monthly values/depressed 
                                 5 to 15%    
31 Oct    90    Normal           Near predicted monthly values   

COMMENT: Maximum usable frequencies (MUFs) in the Australian 
region on UT day 28-Oct were near predicted monthly values with 
enhancements of up to 15% observed during local day and depressions 
of up to 20% during local dawn in the southern Australian region. 
Spread F was observed at Hobart during local night hours and 
mild sporadic E was observed at Townsville during local night 
hours. MUFs are expected to be near predicted monthly values 
over 29-31 Oct, with a chance of mild depressions in the southern 
Australian region due to anticipated 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