[Ips-dhfpr] ASWFC Daily HF Prop Report - 12 November 25 issued 2331 UT on 12 Nov 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

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

1. SUMMARY (12 NOVEMBER) 
Date   T index  Conditions    
12 Nov    84    Poor           

Flares: none.

MUFs:
   Cocos Island Region:
      Depressed by 25% during local day.
      Depressed by 30% during local night.
   Niue Island Region:
      Enhanced by 35% during local day.
      Near predicted monthly values during local night.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian Region:
      Enhanced by 25% during local day.
      Depressed by 25% during local night.
      Depressed by 25% after local dawn.
   Antarctic Region (Casey/Davis/Mawson):
      No data available over the UT day.
      Proton event in progress, increased absorption observed.

PCA Event : 10MeV Proton/PCA Event Began at 1115UT 10/11, Ended at 0155UT 11/11
 and, 10MeV Proton/PCA Event Began 11 11 2025 0950UT and is in progress
 and, 100MeV Proton/PCA Event Began 11 11 2025 1010UT and is in progress

Monthly T index:
Month  T index
Oct      104
Nov      89
Dec      90


2. FORECAST (13 NOVEMBER - 15 NOVEMBER)
Date   T index  Conditions       MUFs                              
13 Nov    75    Fair             Depressed 20%/near predicted 
                                 monthly values
14 Nov    80    Normal-fair      About 15% below predicted monthly 
                                 values    
15 Nov    90    Normal           Near predicted monthly values   

COMMENT: ASWFC Preliminary HF Communications Warning 107 was 
issued on 10 November and is current for 11-13 Nov. ASWFC SWF 
HF Communications Warning 108 was issued on 11 November and is 
current for 11-13 Nov. Maximum usable frequencies (MUFs) in the 
Australian region on UT day 12-Nov were depressed by up to 25%. 
Spread-F during was observed during local night hours in Hobart, 
but was minimal elsewhere across the Australian region. Sporadic-E 
dominated observations during local night hours across most Australian 
sites. Polar Cap Absorption (PCA) is ongoing, and currently affecting 
high latitudes. MUFs are expected to continue to experience 20% 
depressions on UT day 13-Nov with additional PCA expected, before 
conditions improve from 13-Nov and trend towards predicted monthly 
values thereafter.

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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