[Ips-dhfpr] ASWFC Daily HF Prop Report - 18 August 23 issued 2330 UT on 18 Aug 2023 [SEC=OFFICIAL]

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/18 AUGUST 2023
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (18 AUGUST) 
Date   T index  Conditions    
18 Aug   128    Normal-fair    

Flares: none.

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Enhanced by 15% during local night.
   Niue Island Region:
      Enhanced by 20-40%.
   Northern Australian Region:
      Near predicted monthly values to 30% enhanced.
   Southern Australian Region:
      Enhanced by 15-20%.
   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 (19 AUGUST - 21 AUGUST)
Date   T index  Conditions       MUFs                              
19 Aug   125    Normal           Near to 20% above predicted 
                                 monthly values
20 Aug   125    Normal           Near to 20% above predicted 
                                 monthly values    
21 Aug   125    Normal           Near to 20% above predicted 
                                 monthly values   

COMMENT: ASWFC SWF HF Communications Warning 80 was issued on 
17 August and is current for 17-19 Aug. Maximum usable frequencies 
(MUFs) on UT day 18-Aug were near predicted monthly values to 
30% enhanced in the Australian region. Spread was observed in 
Brisbane, Hobart and Canberra during local night hours. Ionospheric 
amplitude scintillation (S4 index of 0.8) was briefly observed 
at Niue 18/0800UT. MUFs are expected to remain near predicted 
values to 20% enhanced over 19-21 Aug. Isolated fadeouts 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