[Ips-dhfpr] ASWFC Daily HF Prop Report - 15 September 25 issued 2330 UT on 15 Sep 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/15 SEPTEMBER 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (15 SEPTEMBER) 
Date   T index  Conditions    
15 Sep   103    Fair           

Flares: none.

MUFs:
   Cocos Island Region:
      No data available.
   Niue Island Region:
      Near predicted monthly values.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian Region:
      Enhanced by 20% during local day.
      Near predicted monthly values during local night.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 25% over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
Aug      96
Sep      92
Oct      90


2. FORECAST (16 SEPTEMBER - 18 SEPTEMBER)
Date   T index  Conditions       MUFs                              
16 Sep   100    Fair             Near predicted monthly values
17 Sep   100    Fair-normal      Near predicted monthly values    
18 Sep   100    Normal           Near predicted monthly values   

COMMENT: ASWFC HF Communications Warning 84 was issued on 15 
September and is current for 15-17 Sep. Maximum usable frequencies 
(MUFs) on UT day 15-Sep were mostly near predicted values. Spread-F 
was observed at Hobart during local night hours. The Australian 
middle latitude ionosphere has not shown a strong depression 
response to recent geomagnetic activity. MUFs are expected to 
be near predicted values on 16-18 Sep.

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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