[Ips-dhfpr] ASWFC Daily HF Prop Report - 04 September 25 issued 2337 UT on 04 Sep 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/04 SEPTEMBER 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (04 SEPTEMBER) 
Date   T index  Conditions    
04 Sep   112    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M1.0    1344UT  possible   lower  European

MUFs:
   Cocos Island Region:
      No data available during local day.
      No data available during local night.
   Niue Island Region:
      Enhanced by 20% during local day.
      Enhanced by 45% during local night.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 15% 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 (05 SEPTEMBER - 07 SEPTEMBER)
Date   T index  Conditions       MUFs                              
05 Sep   105    Normal           Near predicted monthly values
06 Sep   107    Normal           Near predicted monthly values    
07 Sep   108    Normal           Near to 15% below predicted 
                                 monthly values   

COMMENT: ASWFC SWF HF Communications Warning 82 was issued on 
3 September and is current for 3-5 Sep. Maximum usable frequencies 
(MUFs) in the northern Australian region on UT day 04-Sep were 
near predicted monthly values. MUFs in the southern Australian 
region near predicted values during local day and near predicted 
values during local night. Spread F was observed in Perth during 
local night. Sporadic E was observed at Hobart over the UT day. 
Scintillation was observed at Niue on UT day 04 Sep starting 
at 07:11 and ending on 07:30 UT 04 Sep. MUFs are expected to 
be near to predicted monthly values over 05-06 Sep. Near to 15% 
depressions are expected on 7 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