[Ips-dhfpr] ASWFC Daily HF Prop Report - 25 September 25 issued 2330 UT on 25 Sep 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/25 SEPTEMBER 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (25 SEPTEMBER) 
Date   T index  Conditions    
25 Sep   129    Fair-normal    

Flares: none.

MUFs:
   Cocos Island Region:
      Enhanced by 55% during local day.
      Enhanced by 85% during local night.
   Niue Island Region:
      Enhanced by 15-20% during local day.
   Northern Australian Region:
      Enhanced by 15%.
   Southern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 20% 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
Aug      96
Sep      92
Oct      90


2. FORECAST (26 SEPTEMBER - 28 SEPTEMBER)
Date   T index  Conditions       MUFs                              
26 Sep   110    Normal           Near to 15% above predicted 
                                 monthly values
27 Sep   110    Normal-fair      Near to 15% above predicted 
                                 monthly values    
28 Sep   110    Normal-fair      Near to 15% above predicted 
                                 monthly values   

COMMENT: Maximum usable frequencies (MUFs) in the Australian 
region on UT day 25-Sep were near predicted values to 20% enhanced. 
Spread F was observed at Hobart, Canberra and Perth during local 
night hours. Very strong enhancements of up to 85% were observed 
at Cocos Island during the interval 25/0600-1900UT. MUFs are 
expected to be near predicted values to 15% enhanced over 26-28 
Sep. Mildly degraded HF conditions may be experienced for the 
southern Australian region during local night hours on 27-28 
Sep. Isolated minor shortwave fadeouts are possible.

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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