[Ips-dhfpr] ASWFC Daily HF Prop Report - 04 August 23 issued 2330 UT on 04 Aug 2023 [SEC=OFFICIAL]

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/04 AUGUST 2023
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (04 AUGUST) 
Date   T index  Conditions    
04 Aug   107    Normal-fair    

Flares    Max     Fadeout    Freq.  Sectors
  M1.9    0425UT  possible   lower  E. Asia/Aust.

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

PCA Event : No event.

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


2. FORECAST (05 AUGUST - 07 AUGUST)
Date   T index  Conditions       MUFs                              
05 Aug   100    Normal-fair      Near predicted monthly values
06 Aug    90    Normal-fair      Near predicted monthly values 
                                 to 15% depressed    
07 Aug   100    Normal           Near predicted monthly values 
                                 to 10% enhanced   

COMMENT: ASWFC SWF HF Communications Warning 74 was issued on 
4 August and is current for 4-6 Aug. Maximum usable frequencies 
(MUFs) on UT day 04-Aug were near predicted values to 15% enhanced 
in the Australian region. Strong sporadic-E was observed at many 
low-latitude locations during local night hours: Townsville, 
Cocos Islands, Darwin and Learmonth being affected. Spread-F 
was observed in Hobart and Canberra during local night hours. 
MUFs are expected to be near predicted values to 15% depressed 
over 05-06 Aug due to anticipated geomagnetic activity. MUFs 
are expected to return to near predicted values with mild enhancements 
by 07-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