[Ips-dhfpr] ASWFC Daily HF Prop Report - 31 October 25 issued 2332 UT on 31 Oct 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

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

1. SUMMARY (31 OCTOBER) 
Date   T index  Conditions    
31 Oct    78    Fair           

Flares: none.

MUFs:
   Cocos Island Region:
      Enhanced by 25% during local day.
      Near predicted monthly values during local night.
   Niue Island Region:
      Near predicted monthly values.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian Region:
      Depressed by 30% during local day.
      Depressed by 15% during local night.
   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 (01 NOVEMBER - 03 NOVEMBER)
Date   T index  Conditions       MUFs                              
01 Nov    90    Normal-fair      Near predicted monthly values
02 Nov   100    Normal           Near predicted monthly values    
03 Nov   100    Normal           Near predicted monthly values   

COMMENT: Maximum usable frequencies (MUFs) on UT day 30-Oct were 
near predicted monthly values in the northern Australian region. 
MUFs were depressed by 15-30% in the southern Australian region, 
with a recovery towards predicted monthly values observed over 
the UT day. Spread F was observed at Hobart during local night 
hours. Sporadic E was observed at Townsville during local evening 
hours. MUFs are expected to be near predicted monthly values 
on 01-Nov, with a chance of mild depressions in the southern 
Australian region. MUFs are expected to ne near predicted monthly 
values over 02-03 Nov.

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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