[Ips-dhfpr] ASWFC Daily HF Prop Report - 11 November 25 issued 2335 UT on 11 Nov 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

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

1. SUMMARY (11 NOVEMBER) 
Date   T index  Conditions    
11 Nov   111    Normal-fair    

Flares    Max     Fadeout    Freq.  Sectors
  M1.4    0809UT  possible   lower  Mid East/Indian
  X5.1    1004UT  probable   all    European

MUFs:
   Cocos Island Region:
      Enhanced by 35% during local day.
      Enhanced by 65% during local night.
      Enhanced by 45% after local dawn.
   Niue Island Region:
      Near predicted monthly values.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian Region:
      Depressed by 15% during local day.
      Near predicted monthly values during local night.
   Antarctic Region (Casey/Davis/Mawson):
      Near predicted monthly values 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 (12 NOVEMBER - 14 NOVEMBER)
Date   T index  Conditions       MUFs                              
12 Nov    50    Fair             15 to 20% below predicted monthly 
                                 values
13 Nov    55    Normal-fair      Depressed 15%/near predicted 
                                 monthly values    
14 Nov    70    Normal-fair      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 11-Nov were mostly near predicted 
values to 15% depressed. Sporadic-E was observed Townsville, 
Perth, Hobart and Brisbane during local night hours. On UT day 
12-Nov MUFs are expected to initially become depressed by 20% 
shortly after the onset of an anticipated geomagnetic storm. 
Depressions are expected to reach 40-50% by the end of the UT 
day. Depressions of 20-40% are expected to last over 13-14 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