[Ips-dhfpr] ASWFC Daily HF Prop Report - 27 May 23 issued 2331 UT on 27 May 2023 [SEC=OFFICIAL]

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/27 MAY 2023
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (27 MAY) 
Date   T index  Conditions    
27 May    74    Fair-normal    

Flares: none.

MUFs:
   Cocos Island Region:
      Near predicted monthly values.
   Niue Island Region:
      Near predicted monthly values.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 30% during local night.
   Southern Australian Region:
      Near predicted monthly values.
   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
Apr      120
May      87
Jun      88


2. FORECAST (28 MAY - 30 MAY)
Date   T index  Conditions       MUFs                              
28 May    90    Normal           Near predicted monthly values
29 May    90    Normal           Near predicted monthly values    
30 May    90    Normal           Near predicted monthly values   

COMMENT: ASWFC SWF HF Communications Warning 51 was issued on 
25 May and is current for 26-28 May. Maximum usable frequencies 
(MUFs) on UT day 27-May were generally slightly depressed to 
near predicted monthly values in the Australian region during 
the local day, with depressions of up to 30% observed during 
local night hours for northern region Australia. Spread-F was 
observed at some sites during local night hours. MUFs are expected 
to be near predicted monthly values over 28-30 May. 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