[Ips-dhfpr] SWS Daily HF Prop Report - 20 December 19 issued 2354 UT on 20 Dec 2019

[rwc]

SUBJ: SWS DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/20 DECEMBER 2019 BY Space Weather Services
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (20 DECEMBER) 
Date   T index  Conditions    
20 Dec   -34    Normal         

Flares: none.

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Depressed by 15% during local night.
   Niue Island Region:
      Mostly near predicted monthly values.
      Depressed by 25% after local dawn.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian Region:
      Depressed by 20% during local day.
      Depressed by 20% 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
Nov      -30
Dec      -16
Jan      -17


2. FORECAST (21 DECEMBER - 23 DECEMBER)
Date   T index  Conditions       MUFs                              
21 Dec   -30    Normal           Near predicted monthly values/depressed 
                                 10 to 30%
22 Dec   -30    Normal           Near predicted monthly values/depressed 
                                 10 to 30%    
23 Dec   -30    Normal           Near predicted monthly values   

COMMENT: HF conditions ranged from mildly depressed maximum usable 
frequencies (MUFs) to MUFS near predicted monthly values for 
20Dec with significant sporadic-E observed at most low to mid 
latitude sites in the first half of the UT day. MUFs for Antarctic 
regions were mostly at near predicted monthly values. Similar 
ionospheric support is expected for the next 3 days.

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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
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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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