[Ips-dhfpr] ASWFC Daily HF Prop Report - 31 August 23 issued 2330 UT on 31 Aug 2023 [SEC=OFFICIAL]

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/31 AUGUST 2023
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (31 AUGUST) 
Date   T index  Conditions    
31 Aug   111    Normal         

Flares: none.

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Enhanced by 20% during local night.
   Niue Island Region:
      Enhanced by 15% during local day.
      Enhanced by 70% during local night.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 35% during local night.
   Southern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 20% during local night.
   Antarctic Region (Casey/Davis/Mawson):
      Enhanced by 20% over the UT day.

PCA Event : No event.

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


2. FORECAST (01 SEPTEMBER - 03 SEPTEMBER)
Date   T index  Conditions       MUFs                              
01 Sep   105    Normal           Near predicted monthly values 
                                 to 15-20% enhanced
02 Sep   105    Normal-fair      Near predicted monthly values    
03 Sep    95    Fair             Near predicted monthly values 
                                 to 15-20% depressed   

COMMENT: ASWFC Preliminary HF Communications Warning 84 was issued 
on 31 August and is current for 3-4 Sep. Maximum usable frequencies 
(MUFs) on UT day 31-Aug were near predicted values to 35% enhanced 
in the Australian region. Range spread was observed at Niue Island 
during local night hours. Scintillation was observed at Niue 
and Weipa from 31/0801-1134 UT. MUFs are expected to be near 
predicted values over 01-02 Sep to 20% enhanced, but by 03-Sep 
are expected to become depressed by 15-20% due to anticipated 
geomagnetic activity. Degradations are likely by late UT day 
02-Sep and 03-Sep.

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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