[Ips-dhfpr] ASWFC Daily HF Prop Report - 08 August 23 issued 2330 UT on 08 Aug 2023 [SEC=OFFICIAL]

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/08 AUGUST 2023
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (08 AUGUST) 
Date   T index  Conditions    
08 Aug   113    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M3.6    0931UT  possible   lower  Mid East/Indian

MUFs:
   Cocos Island Region:
      Enhanced by 15% during local day.
      Enhanced by 75% during local night.
   Niue Island Region:
      Near predicted monthly values.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 15% during local night.
   Southern Australian Region:
      Enhanced by 15% during local day.
      Near predicted monthly values during local night.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Near predicted monthly values over the UT day.
      Proton event in progress, increased absorption observed.

PCA Event : 10MeV Proton/PCA Event Began 08 08 2023 0105UT and is in progress

Monthly T index:
Month  T index
Jul      103
Aug      88
Sep      84


2. FORECAST (09 AUGUST - 11 AUGUST)
Date   T index  Conditions       MUFs                              
09 Aug   110    Normal           Near predicted monthly values 
                                 to 15% enhanced
10 Aug   110    Normal           Near predicted monthly values 
                                 to 15% enhanced    
11 Aug   105    Normal           Near predicted monthly values 
                                 to 15% enhanced   

COMMENT: ASWFC Preliminary HF Communications Warning 77 was issued 
on 7 August and is current for 8-9 Aug. ASWFC SWF HF Communications 
Warning 78 was issued on 8 August and is current for 9-11 Aug. 
Maximum usable frequencies (MUFs) on UT day 08-Aug were near 
predicted values to 15% enhanced in the Australian region. Spread-F 
was observed in Hobart and degraded conditions were observed 
in Townsville. Scintillation was observed at Niue Island between 
08/0906 - 0922 UT. Due to S1 solar radiation storm conditions, 
degraded conditions have been observed in Antarctica and are 
expected to continue over 09-Aug before returning to normal. 
MUFs are expected to be near predicted values over 09-11 Aug 
with enhancements of 15% possible. 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