[Ips-dhfpr] ASWFC Daily HF Prop Report - 06 August 23 issued 2330 UT on 06 Aug 2023 [SEC=OFFICIAL]

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/06 AUGUST 2023
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (06 AUGUST) 
Date   T index  Conditions    
06 Aug   105    Fair-poor      

Flares    Max     Fadeout    Freq.  Sectors
  M5.5    1840UT  possible   lower  East Pacific/
                                    North American

MUFs:
   Cocos Island Region:
      Near predicted monthly values.
   Niue Island Region:
      Enhanced by 35% during local day.
      Depressed by 15% during local night.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian Region:
      Mostly near predicted monthly values.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Near predicted monthly values over the UT day.

PCA Event : 10MeV Proton/PCA Event Began at 1105UT 05/08, Ended at 2000UT 05/08
 and, 10MeV Proton/PCA Event Began at 2340UT 05/08, Ended at 0435UT 06/08

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


2. FORECAST (07 AUGUST - 09 AUGUST)
Date   T index  Conditions       MUFs                              
07 Aug   105    Normal           Near predicted monthly values
08 Aug    90    Fair             Near predicted monthly values/depressed 
                                 0 to 15%    
09 Aug    90    Normal-fair      Near predicted monthly values/depressed 
                                 0 to 15%   

COMMENT: ASWFC SWF HF Communications Warning 76 was issued on 
5 August and is current for 6-8 Aug. Maximum usable frequencies 
(MUFs) on UT day 6-Aug were near predicted monthly values in 
the Australian region. Significant spread-F was observed in Canberra, 
Hobart, Norfolk Island, Brisbane and Townsville, during local 
night hours. MUFs are expected to be near predicted monthly values 
on 7-Aug. MUFs are expected to be near predicted monthly values 
to 15% depressed over 8-9 Aug due to geomagnetic activity from 
multiple anticipated CME impacts. A recovery to near predicted 
monthly values is expected in the second half of 9-Aug. 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