[Ips-dhfpr] ASWFC Daily HF Prop Report - 01 September 25 issued 2331 UT on 01 Sep 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/01 SEPTEMBER 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (01 SEPTEMBER) 
Date   T index  Conditions    
01 Sep   126    Normal         

Flares: none.

MUFs:
   Cocos Island Region:
      No data available.
   Niue Island Region:
      Enhanced by 15% during local day.
      Enhanced by 45% during local night.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 60% during local night.
   Southern Australian Region:
      Enhanced by 15% during local day.
      Enhanced by 20% during local night.
      Enhanced by 20% after local dawn.
   Antarctic Region (Casey/Davis/Mawson):
      Enhanced by 15% over the UT day.

PCA Event : No event.

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


2. FORECAST (02 SEPTEMBER - 04 SEPTEMBER)
Date   T index  Conditions       MUFs                              
02 Sep    90    Poor             Near predicted monthly values
03 Sep   100    Normal-fair      Near predicted monthly values    
04 Sep   110    Normal           Near to 15% above predicted 
                                 monthly values   

COMMENT: ASWFC Preliminary HF Communications Warning 79 was issued 
on 31 August and is current for 2-3 Sep. ASWFC SWF HF Communications 
Warning 80 was issued on 31 August and is current for 1-2 Sep. 
Maximum usable frequencies (MUFs) in the Australian region on 
UT day 01-Sep were near predicted monthly values to 15-60% enhanced. 
Spread F was observed at Hobart during local night hours. Ionospheric 
scintillation was observed at Niue over the interval 01/0822-0840UT. 
Current geomagnetic activity is expected to reduce the observed 
MUF enhancements to near predicted monthly values over 02-03 
Sep. MUFs are expected to be near predicted monthly values to 
15% enhanced on 04-Sep. 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