[Ips-dhfpr] ASWFC Daily HF Prop Report - 21 July 23 issued 2330 UT on 21 Jul 2023 [SEC=OFFICIAL]

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/21 JULY 2023
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (21 JULY) 
Date   T index  Conditions    
21 Jul   116    Normal         

Flares: none.

MUFs:
   Cocos Island Region:
      Enhanced by 25% during local day.
      Near predicted monthly values during local night.
   Niue Island Region:
      Near predicted monthly values during local day.
      Enhanced by 30% during local night.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 15% during local night.
   Southern Australian Region:
      Enhanced by 20% during local day.
      Enhanced by 25% during local night.
      Enhanced by 20% after local dawn.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Near predicted monthly values over the UT day.

PCA Event : 10MeV Proton/PCA Event Began at 0105UT 18/07, Ended at 0335UT 20/07

Monthly T index:
Month  T index
Jun      98
Jul      91
Aug      88


2. FORECAST (22 JULY - 24 JULY)
Date   T index  Conditions       MUFs                              
22 Jul   110    Normal           Near predicted monthly values, 
                                 with a chance of mild depressions.
23 Jul   115    Normal           Near to 15% above predicted 
                                 monthly values    
24 Jul   110    Normal           Near to 15% above predicted 
                                 monthly values   

COMMENT: Maximum usable frequencies (MUFs) on UT day 21-Jul were 
generally near predicted monthly values to 25% enhanced in the 
southern Australian region and near predicted monthly values 
to 15% enhanced in the northern Australian region. MUFs are expected 
to be generally near predicted monthly values on 22-Jul, with 
a chance of mild depressions in the southern Australian region, 
due to geomagnetic activity from a recently observed CME impact. 
MUFs are expected to be near predicted monthly values to 15% 
enhanced over 23-24 Jul. 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