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

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/23 SEPTEMBER 2023
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (23 SEPTEMBER) 
Date   T index  Conditions    
23 Sep   112    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M1.9 22/2300UT  possible   lower  West Pacific
  M1.5    2043UT  possible   lower  East Pacific/
                                    North American

MUFs:
   Cocos Island Region:
      Enhanced by 30% during local day.
      Enhanced by 60% during local night.
   Niue Island Region:
      Enhanced by 15% during local day.
      Near predicted monthly values during local night.
   Northern Australian Region:
      Mostly near predicted monthly values.
   Southern Australian Region:
      Mostly near predicted monthly values.
      Enhanced by 20% 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
Aug      115
Sep      96
Oct      93


2. FORECAST (24 SEPTEMBER - 26 SEPTEMBER)
Date   T index  Conditions       MUFs                              
24 Sep   110    Normal-fair      Near predicted monthly values
25 Sep   100    Normal-fair      Near predicted monthly values    
26 Sep   100    Normal           Near predicted monthly values   

COMMENT: ASWFC SWF HF Communications Warning 98 was issued on 
22 September and is current for 23-25 Sep. ASWFC Preliminary 
HF Communications Warning 99 was issued on 23 September and is 
current for 24-26 Sep. Maximum usable frequencies (MUFs) in the 
Australian region on UT day 23-Sep were near predicted values 
in the northern Australian region and near predicted monthly 
values to 20% enhanced in the southern Australian region. Brief 
spread-F was observed at Hobart during local night hours. MUFs 
are expected to be near predicted values over 24-26 Sep, with 
the possibility of mild depressions on 25-26 Sep, especially 
in the southern Australian region, due to possible geomagnetic 
activity. Shortwave fadeouts are probable.

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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