[Ips-dhfpr] ASWFC Daily HF Prop Report - 25 November 23 issued 2331 UT on 25 Nov 2023 [SEC=OFFICIAL]

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/25 NOVEMBER 2023
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (25 NOVEMBER) 
Date   T index  Conditions    
25 Nov   114    Normal-poor    

Flares: none.

MUFs:
   Cocos Island Region:
      Mostly near predicted monthly values.
      Enhanced by 20% after local dawn.
   Niue Island Region:
      Mostly near predicted monthly values.
      Depressed by 20% after local dawn.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 20% during local night.
      Depressed by 30% after local dawn.
   Southern Australian Region:
      Enhanced by 20% during local day.
      Enhanced by 30% during local night.
      Depressed by 40% 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
Oct      130
Nov      100
Dec      98


2. FORECAST (26 NOVEMBER - 28 NOVEMBER)
Date   T index  Conditions       MUFs                              
26 Nov    30    Poor-fair        15 to 30% below predicted monthly 
                                 values
27 Nov    70    Fair             Depressed 10 to 20%/near predicted 
                                 monthly values    
28 Nov   110    Normal           Near predicted monthly values   

COMMENT: ASWFC HF Communications Warning 120 was issued on 25 
November and is current for 26 Nov only. Maximum usable frequencies 
(MUFs) were initially near predicted monthly values to 15% enhanced, 
becoming depressed by up to 40% after local dawn this morning 
following overnight geomagnetic storm activity. Strong spread-F 
was observed at Hobart during local night hours. Australian regional 
MUFs are expected to be depressed by 20-30% for 26-Nov. Further 
less severe depressions may be experienced on 27-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