[Ips-dhfpr] ASWFC Daily HF Prop Report - 20 May 24 issued 2330 UT on 20 May 2024 [SEC=OFFICIAL]

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/20 MAY 2024
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (20 MAY) 
Date   T index  Conditions    
20 May   146    Normal-fair        

Flares: none.

MUFs:
   Cocos Island Region:
      Enhanced by 35% during local day.
      Enhanced by 15% during local night.
      Enhanced by 20% after local dawn.
   Niue Island Region:
      Enhanced by 15% during local day.
      Near predicted monthly values during local night.
   Northern Australian Region:
      Enhanced by 15% during local day.
      Enhanced by 40% during local night.
   Southern Australian Region:
      Enhanced by 15% during local day.
      Near predicted monthly values during local night.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 25% over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
Apr      125
May      114
Jun      116


2. FORECAST (21 MAY - 23 MAY)
Date   T index  Conditions       MUFs                              
21 May   145    Normal           Near to 15% above predicted 
                                 monthly values
22 May   145    Normal           Near to 15% above predicted 
                                 monthly values    
23 May   145    Normal-fair      Near to 15% above predicted 
                                 monthly values   

COMMENT: ASWFC SWF HF Communications Warning 54 was issued on 
19 May and is current for 20-22 May. Maximum usable frequencies 
(MUFs) on UT day 20-May were near predicted monthly values to 
40% enhanced. Spread F was observed at Hobart during local night 
hours. Weak ionospheric phase scintillation was observed at Darwin 
20/08-14UT. MUFs are expected to be near predicted monthly values 
to 15% enhanced over 21-23 May. 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