[Ips-dhfpr] ASWFC Daily HF Prop Report - 12 August 25 issued 2330 UT on 12 Aug 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/12 AUGUST 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (12 AUGUST) 
Date   T index  Conditions    
12 Aug    91    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M1.5    0059UT  possible   lower  West Pacific
  M1.8    0123UT  possible   lower  West Pacific

MUFs:
   Cocos Island Region:
      Enhanced by 25% during local day.
      Near predicted monthly values during local night.
      Depressed by 25% after local dawn.
   Niue Island Region:
      Near predicted monthly values during local day.
      Depressed by 25% during local night.
   Northern Australian Region:
      Enhanced by 20% during local day.
      Near predicted monthly values during local night.
   Southern Australian Region:
      Near predicted monthly values.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 20% over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
Jul      88
Aug      96
Sep      93


2. FORECAST (13 AUGUST - 15 AUGUST)
Date   T index  Conditions       MUFs                              
13 Aug    90    Normal           Near predicted monthly values
14 Aug    90    Normal           Near predicted monthly values    
15 Aug    90    Normal           Near predicted monthly values   

COMMENT: Maximum usable frequencies (MUFs) in the Australian 
region on UT day 12-Aug were near predicted monthly values to 
20% enhanced. Spread F was observed at Hobart, Learmonth, Canberra 
and Perth during local night hours. MUFs are expected to be near 
predicted monthly values over 13-15 Aug. Isolated minor 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