[Ips-dhfpr] ASWFC Daily HF Prop Report - 09 September 25 issued 2330 UT on 09 Sep 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/09 SEPTEMBER 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (09 SEPTEMBER) 
Date   T index  Conditions    
09 Sep    84    Normal         

Flares: none.

MUFs:
   Cocos Island Region:
      No data available.
   Niue Island Region:
      Enhanced by 20% during local day.
      Near predicted monthly values during local night.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 15% during local night.
   Southern Australian Region:
      Depressed by 15% during local day.
      Near predicted monthly values 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 (10 SEPTEMBER - 12 SEPTEMBER)
Date   T index  Conditions       MUFs                              
10 Sep    90    Normal           Near predicted monthly values/depressed 
                                 10 to 15%
11 Sep    95    Normal           Near predicted monthly values/depressed 
                                 10 to 15%    
12 Sep    95    Normal           Near predicted monthly values/depressed 
                                 10 to 15%   

COMMENT: Maximum usable frequencies (MUFs) in the northern Australian 
region on UT day 09-Sep were near predicted monthly values to 
depressed by 15% during local night. Spread F was observed at 
Canberra and Hobart during local night and dawn hours. Spread 
F is forecasted at high latitudes during local night due to the 
ongoing coronal hole. MUFs are expected to be near predicted 
monthly values to depressed by 15% on 10-12 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