[Ips-dhfpr] ASWFC Daily HF Prop Report - 25 September 23 issued 2330 UT on 25 Sep 2023 [SEC=OFFICIAL]

[Regional Warning Centre]

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

1. SUMMARY (25 SEPTEMBER) 
Date   T index  Conditions    
25 Sep   105    Normal         

Flares: none.

MUFs:
   Cocos Island Region:
      Near predicted monthly values.
   Niue Island Region:
      Enhanced by 20% during local day.
      Near predicted monthly values during local night.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian Region:
      Depressed by 15% during local day.
      Near predicted monthly values during local night.
      Enhanced by 45% after local dawn.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 40% over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
Aug      115
Sep      96
Oct      93


2. FORECAST (26 SEPTEMBER - 28 SEPTEMBER)
Date   T index  Conditions       MUFs                              
26 Sep   100    Fair-normal      Near predicted monthly values
27 Sep   100    Normal           Near predicted monthly values    
28 Sep   100    Normal           Near predicted monthly values   

COMMENT: ASWFC SWF HF Communications Warning 100 was issued on 
24 September and is current for 25-27 Sep. ASWFC Preliminary 
HF Communications Warning 101 was issued on 25 September and 
is current for 25-26 Sep. Maximum usable frequencies (MUFs) in 
the Australian region on UT day 25-Sep were depressed by 15% 
in the southern Australian region and near predicted values in 
the northern Australian region. Spread-F was observed at Hobart 
and Perth during local night hours. Hobart MUFs were enhanced 
by 20% after local dawn this morning. MUFs are expected to be 
near monthly predicted values over 26-28 Sep. Shortwave fadeouts 
are possible.

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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