[Ips-dhfpr] ASWFC Daily HF Prop Report - 31 August 25 issued 2331 UT on 31 Aug 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/31 AUGUST 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (31 AUGUST) 
Date   T index  Conditions    
31 Aug   122    Normal         

Flares: none.

MUFs:
   Cocos Island Region:
      No data available during local day.
      No data available during local night.
   Niue Island Region:
      Near predicted monthly values during local day.
      Enhanced by 20% during local night.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 15% during local night.
   Southern Australian Region:
      Enhanced by 15% during local day.
      Enhanced by 20% 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 (01 SEPTEMBER - 03 SEPTEMBER)
Date   T index  Conditions       MUFs                              
01 Sep   100    Normal-fair      Near predicted monthly values 
                                 to 20% enhanced
02 Sep    90    Normal-fair      Near predicted monthly values 
                                 to 20% depressed    
03 Sep    95    Normal-fair      Near predicted monthly values 
                                 to 20% depressed   

COMMENT: Maximum usable frequencies (MUFs) in the Australian 
region on UT day 31-Aug were near predicted valued to 20% enhanced. 
Spread-F was observed in Hobart during local dawn hours. Scintillation 
was observed at Niue from 08:25 to 08:40 UT. Conditions were 
briefly degraded at Norfolk Island during local dusk hours. MUFs 
are expected to be normal to 20% enhanced until the CME arrival 
late on 1-Sep or early 2-Sep. MUFs may become depressed up to 
20% afterwards over 2-3 Sep.

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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