[Ips-dhfpr] ASWFC Daily HF Prop Report - 01 October 25 issued 2330 UT on 01 Oct 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/01 OCTOBER 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (01 OCTOBER) 
Date   T index  Conditions    
01 Oct    96    Fair           

Flares    Max     Fadeout    Freq.  Sectors
  M1.2    0226UT  possible   lower  E. Asia/Aust.
  M1.2    1650UT  possible   lower  South American/
                                    Atlantic

MUFs:
   Cocos Island Region:
      Enhanced by 25% during local day.
      Near predicted monthly values during local night.
      Enhanced by 20% after local dawn.
   Niue Island Region:
      Enhanced by 20% during local day.
      Enhanced by 20% during local night.
      Enhanced by 30% after local dawn.
   Northern Australian Region:
      Enhanced by 15% during local day.
      Near predicted monthly values during local night.
   Southern Australian Region:
      Depressed by 20% during local day.
      Depressed by 20% during local night.
      Depressed by 30% after local dawn.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 20% over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
Sep      109
Oct      89
Nov      89


2. FORECAST (02 OCTOBER - 04 OCTOBER)
Date   T index  Conditions       MUFs                              
02 Oct   100    Normal-fair      Near predicted monthly values 
                                 to 30% depressed
03 Oct    95    Fair             Near predicted monthly values 
                                 to 30% depressed    
04 Oct    90    Fair             Near predicted monthly values 
                                 to 30% depressed   

COMMENT: Maximum usable frequencies (MUFs) in the Australian 
region on UT day 1-Oct were depressed up to 30% in the southern 
regions but up to 15% enhanced in the northern regions. Signal 
spreading was observed in Canberra, Perth and Hobart. Sporadic-E 
was observed in Darwin and Perth. Conditions were generally degraded 
in Darwin and Hobart during local night hours. MUFs are expected 
to be near predicted values to 30% depressed over 2-4 Oct.

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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