[Ips-dhfpr] SWS Daily HF Prop Report - 25 May 21 issued 2330 UT on 25 May 2021

[Regional Warning Centre]

SUBJ: SWS DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/25 MAY 2021 BY Space Weather Services
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (25 MAY) 
Date   T index  Conditions    
25 May     8    Normal         

Flares: none.

MUFs:
   Cocos Island Region:
      No data available.
   Niue Island Region:
      No data available.
   Northern Australian Region:
      Depressed by 15% during local day.
      Near predicted monthly values during local night.
   Southern Australian Region:
      Near predicted monthly values.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Enhanced by 30% over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
Apr      12
May      21
Jun      24


2. FORECAST (26 MAY - 28 MAY)
Date   T index  Conditions       MUFs                              
26 May     5    Normal-fair      Near predicted monthly values
27 May     0    Fair             Near predicted monthly values/depressed 
                                 10 to 30%    
28 May    10    Normal-fair      Near predicted monthly values/depressed 
                                 10 to 20%   

COMMENT: SWS HF Communications Warning 17 was issued on 25 May 
and is current for 26-27 May. MUFs in the Australian region on 
UT day 25 May were mostly near predicted monthly values with 
some minor depressions in the Northern Australian region during 
the local day. Mostly normal MUFs can be expected on UT day 26 
May with some possible enhancements during the first half of 
the UT day followed by possible minor to moderate depressions. 
Moderate to significant MUF depressions could occur on UT day 
27 May due to expected increase in geomagnetic activity with 
possible slow recovery in MUFs on 28 May as the geomagnetic activity 
weakens.

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For an explanation of some of the terms in this report, go to
http://www.sws.bom.gov.au, and follow links to Educational->
Glossary on Solar Terrestrial Terms.

Space Weather Services              email: asfc at bom.gov.au
Bureau of Meteorology
PO Box 1386                         WWW: http://www.sws.bom.gov.au
Haymarket NSW 1240  AUSTRALIA       FTP: ftp://ftp-out.sws.bom.gov.au
tel: +61 2 9213 8010                fax: +61 2 9213 8060 

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