[Ips-dhfpr] ASWFC Daily HF Prop Report - 11 October 25 issued 2330 UT on 11 Oct 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/11 OCTOBER 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (11 OCTOBER) 
Date   T index  Conditions    
11 Oct   112    Normal-fair    

Flares: none.

MUFs:
   Cocos Island Region:
      Enhanced by 30% during local day.
      Enhanced by 40% during local night.
   Niue Island Region:
      Mostly near predicted monthly values.
      Depressed by 20% after local dawn.
   Northern Australian Region:
      Enhanced by 20% during local day.
      Enhanced by 25% during local night.
   Southern Australian Region:
      Enhanced by 20% during local day.
      Near predicted monthly values during local night.
      Depressed by 25% after local dawn.
   Antarctic Region (Casey/Davis/Mawson):
      Near predicted monthly values over the UT day.

PCA Event : No event.

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


2. FORECAST (12 OCTOBER - 14 OCTOBER)
Date   T index  Conditions       MUFs                              
12 Oct    80    Normal-fair      Southern Australian region 15-25% 
                                 depressed
13 Oct    80    Normal-fair      Southern Australian region 15% 
                                 depressed    
14 Oct   105    Normal           Near predicted monthly values   

COMMENT: Maximum usable frequencies (MUFs) in the northern Australian 
region on UT day 11-Oct were 20-25% enhanced. Southern Australian 
region MUFs were 20% enhanced during local day, but are so far 
25% depressed after local dawn. Spread-F was observed at Hobart 
during local night hours. Southern Australian region MUFs are 
expected to be 15-25% depressed at times over 12-13 Oct with 
northern Australian region MUFs generally expected to remain 
near predicted monthly values to 15% enhanced. MUFs are expected 
to recover to near predicted monthly values on 14-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