[Ips-dhfpr] ASWFC Daily HF Prop Report - 11 August 25 issued 2330 UT on 11 Aug 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/11 AUGUST 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (11 AUGUST) 
Date   T index  Conditions    
11 Aug    79    Normal-fair    

Flares    Max     Fadeout    Freq.  Sectors
  M1.7 10/2305UT  possible   lower  West Pacific
  M1.3    0352UT  possible   lower  E. Asia/Aust.
  M1.5    1435UT  possible   lower  South American/
                                    Atlantic
  M1.6    1536UT  possible   lower  South American/
                                    Atlantic

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Depressed by 20% during local night.
   Niue Island Region:
      Enhanced by 35% during local day.
      Enhanced by 40% during local night.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 20% during local night.
   Southern Australian Region:
      Depressed by 15% during local day.
      Depressed by 15% 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
Jul      88
Aug      96
Sep      93


2. FORECAST (12 AUGUST - 14 AUGUST)
Date   T index  Conditions       MUFs                              
12 Aug    80    Normal-fair      Near predicted monthly values
13 Aug    85    Normal           Near predicted monthly values    
14 Aug    90    Normal           Near predicted monthly values   

COMMENT: ASWFC SWF HF Communications Warning 75 was issued on 
10 August and is current for 11-12 Aug. Maximum usable frequencies 
(MUFs) in the Australian region on UT day 11-Aug were near predicted 
monthly values to 15-20% depressed. Spread F was observed at 
Hobart, Canberra and Perth during local night hours. MUFs are 
expected to be near predicted monthly values over 12-14 Aug. 
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