[Ips-dhfpr] ASWFC Daily HF Prop Report - 06 August 25 issued 2330 UT on 06 Aug 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/06 AUGUST 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (06 AUGUST) 
Date   T index  Conditions    
06 Aug    90    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M1.0    1702UT  possible   lower  South American/
                                    Atlantic

MUFs:
   Cocos Island Region:
      Enhanced by 40% during local day.
      No data available during local night.
   Niue Island Region:
      Near predicted monthly values during local day.
      Depressed by 20% during local night.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 20% during local night.
   Southern Australian Region:
      Near predicted monthly values during local day.
      Depressed 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
Jul      88
Aug      96
Sep      93


2. FORECAST (07 AUGUST - 09 AUGUST)
Date   T index  Conditions       MUFs                              
07 Aug    85    Normal           Near predicted monthly values
08 Aug    80    Normal-fair      Near predicted monthly values    
09 Aug    80    Normal-fair      Near predicted monthly values   

COMMENT: ASWFC SWF HF Communications Warning 73 was issued on 
4 August and is current for 5-7 Aug. Maximum usable frequencies 
(MUFs) in the Australian region on UT day 07-Aug were near predicted 
monthly values, with depressions observed in the northern Australian 
region during local night hours. Spread F was observed at Hobart 
and Perth during local night hours. MUFs are expected to be near 
predicted monthly values over 07-09 Aug, with a slight chance 
of mild depressions over 08-09 Aug due to expected geomagnetic 
activity. 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