[Ips-dhfpr] SWS Daily HF Prop Report - 20 October 21 issued 2331 UT on 20 Oct 2021

[Regional Warning Centre]

SUBJ: SWS DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/20 OCTOBER 2021 BY Space Weather Services
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (20 OCTOBER) 
Date   T index  Conditions    
20 Oct   -16    Normal-fair    

Flares: none.

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Depressed by 20% during local night.
   Niue Island Region:
      No data available during local day.
      No data available during local night.
   Northern Australian Region:
      Depressed by 25% during local day.
      Depressed by 30% during local night.
      Depressed by 20% after local dawn.
   Southern Australian Region:
      Depressed by 25% during local day.
      Depressed by 30% during local night.
      Depressed by 20% after local dawn.
   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
Sep      24
Oct      29
Nov      33


2. FORECAST (21 OCTOBER - 23 OCTOBER)
Date   T index  Conditions       MUFs                              
21 Oct     0    Normal-fair      Near predicted monthly values/depressed 
                                 10 to 30%
22 Oct     5    Normal-fair      Near predicted monthly values/depressed 
                                 10 to 20%    
23 Oct    10    Normal           Near predicted monthly values   

COMMENT: MUFs in the Australian region on UT day 20 October were 
mostly near predicted monthly values, with some moderate depressions 
in the northern Australian region and the Southern Australian 
region. There were also some mild depressions in the Cocos Island 
region during the local night. MUFs are expected to be mostly 
near predicted monthly values on UT days 21-23 October. Some 
mild to moderate MUF depressions are possible on UT days 21-22 
October due to the increase in geomagnetic activity.

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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.

Space Weather Services              email: asfc at bom.gov.au
Bureau of Meteorology
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