[Ips-dhfpr] ASWFC Daily HF Prop Report - 24 September 23 issued 2334 UT on 24 Sep 2023 [SEC=OFFICIAL]

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SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/24 SEPTEMBER 2023
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (24 SEPTEMBER) 
Date   T index  Conditions    
24 Sep   113    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M1.2    0307UT  possible   lower  E. Asia/Aust.
  M1.9    0314UT  possible   lower  E. Asia/Aust.
  M4.4    0328UT  possible   lower  E. Asia/Aust.
  M1.0    1500UT  possible   lower  South American/
                                    Atlantic

MUFs:
   Cocos Island Region:
      Enhanced by 15% during local day.
      Enhanced by 40% during local night.
   Niue Island Region:
      Enhanced by 20% during local day.
      Enhanced by 50% during local night.
      Enhanced by 20% after local dawn.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian Region:
      Near predicted monthly values.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 15% over the UT day.

PCA Event : No event.

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


2. FORECAST (25 SEPTEMBER - 27 SEPTEMBER)
Date   T index  Conditions       MUFs                              
25 Sep   100    Fair             Near predicted monthly values/depressed 
                                 10 to 15%
26 Sep   115    Normal           Near to 15% above predicted 
                                 monthly values    
27 Sep   115    Normal           Near to 15% above predicted 
                                 monthly values   

COMMENT: ASWFC Preliminary HF Communications Warning 99 was issued 
on 23 September and is current for 24-26 Sep. ASWFC SWF HF Communications 
Warning 100 was issued on 24 September and is current for 25-27 
Sep. Maximum usable frequencies (MUFs) in the Australian region 
on UT day 24-Sep were near predicted values in the Australian 
region. Spread-F was observed at Hobart during local night hours. 
Depressions are expected on 25-Sep, particularly in the southern 
Australian region, due to recent and ongoing geomagnetic activity. 
Depressions may continue into 26-Sep dependent on how long the 
geomagnetic activity persists. Otherwise MUFs are expected to 
be near monthly predicted values to 15% enhanced over 26-27 Sep. 
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