[Ips-dhfpr] ASWFC Daily HF Prop Report - 10 August 23 issued 2333 UT on 10 Aug 2023 [SEC=OFFICIAL]

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SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/10 AUGUST 2023
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (10 AUGUST) 
Date   T index  Conditions    
10 Aug   105    Normal-fair    

Flares: none.

MUFs:
   Cocos Island Region:
      Near predicted monthly values.
   Niue Island Region:
      Mostly near predicted monthly values.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 15% during local night.
   Southern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 20% during local night.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Near predicted monthly values over the UT day.

PCA Event : 10MeV Proton/PCA Event Began at 0105UT 08/08, Ended at 0915UT 10/08

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


2. FORECAST (11 AUGUST - 13 AUGUST)
Date   T index  Conditions       MUFs                              
11 Aug   110    Normal           Near to 15% above predicted 
                                 monthly values
12 Aug   110    Normal           Near to 15% above predicted 
                                 monthly values    
13 Aug   110    Normal           Near to 15% above predicted 
                                 monthly values   

COMMENT: 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 10-Aug were near predicted monthly values to 
20% enhanced in the southern Australian region and near predicted 
monthly values to 15% enhanced in the northern Australian region. 
With most enhancements occurring during local night hours. Spread-F 
was observed in Hobart, Canberra and Brisbane during local night 
hours. Scintillation was observed at Weipa between 10/1050UT 
- 10/1259UT. Polar cap absorption (PCA), due to an S1 solar radiation 
event, caused degraded conditions in Antarctica at the start 
of the day. Further PCA is possible over 11-13 Aug if S1 conditions 
return. MUFs are expected to be near predicted monthly values 
to 15% enhanced over 11-13 Aug. Isolated 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