[Ips-dhfpr] ASWFC Daily HF Prop Report - 17 August 25 issued 2330 UT on 17 Aug 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/17 AUGUST 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (17 AUGUST) 
Date   T index  Conditions    
17 Aug    94    Normal-fair    

Flares: none.

MUFs:
   Cocos Island Region:
      Near predicted monthly values.
   Niue Island Region:
      Near predicted monthly values.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 15% during local night.
   Southern Australian Region:
      Near predicted monthly values.
   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 (18 AUGUST - 20 AUGUST)
Date   T index  Conditions       MUFs                              
18 Aug    90    Normal-fair      Near predicted monthly values
19 Aug    80    Normal-fair      Near predicted monthly values    
20 Aug    80    Normal-fair      Near predicted monthly values   

COMMENT: Maximum usable frequencies (MUFs) in the Australian 
region on UT day 17-Aug were mostly near predicted monthly values 
with depressions of 15% observed in the Northern Australian region 
during local night hours. Spread F was observed at Canberra, 
Darwin, Hobart and Perth during local night hours. MUFs are expected 
to be near predicted monthly values over 18-20 Aug.

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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