[Ips-dhfpr] ASWFC Daily HF Prop Report - 12 August 23 issued 2330 UT on 12 Aug 2023 [SEC=OFFICIAL]

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/12 AUGUST 2023
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (12 AUGUST) 
Date   T index  Conditions    
12 Aug   107    Normal         

Flares: none.

MUFs:
   Cocos Island Region:
      Near predicted monthly values.
   Niue Island Region:
      Enhanced by 20% during local day.
      Enhanced by 85% during local night.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian Region:
      Enhanced by 15% during local day.
      Enhanced by 25% during local night.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Near predicted monthly values over the UT day.

PCA Event : No event.

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


2. FORECAST (13 AUGUST - 15 AUGUST)
Date   T index  Conditions       MUFs                              
13 Aug   105    Normal           Near to 15% above predicted 
                                 monthly values
14 Aug   105    Normal           Near to 15% above predicted 
                                 monthly values    
15 Aug   105    Normal           Near to 15% above predicted 
                                 monthly values   

COMMENT: ASWFC SWF HF Communications Warning 79 was issued on 
11 August and is current for 11-13 Aug. Maximum usable frequencies 
(MUFs) on UT day 12-Aug were near predicted monthly values to 
25% enhanced in the southern Australian region during local night 
an up to 15% percent enhanced during local day. MUFs were near 
predicted monthly values in the northern Australian region. Spread-F 
was observed in Hobart, Darwin and Niue, with a small amount 
observed at Canberra during local night hours. Mild depressions 
were observed in Darwin mostly during periods in which spread-F 
was observed. Significant sporadic E was observed at Cocos Island 
between 12/2000UT - 12/2300UT. MUFs are expected to be near predicted 
monthly values to 15% enhanced over 13-15 Aug, particularly in 
the southern Australian region. 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