[Ips-dhfpr] SWS Daily HF Prop Report - 21 December 21 issued 2332 UT on 21 Dec 2021

[rwc]

SUBJ: SWS DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/21 DECEMBER 2021 BY Space Weather Services
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (21 DECEMBER) 
Date   T index  Conditions    
21 Dec    61    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M1.1    0750UT  possible   lower  Mid East/Indian
  M1.4    1144UT  possible   lower  European

MUFs:
   Cocos Island Region:
      Near predicted monthly values.
   Niue Island Region:
      Near predicted monthly values during local day.
      Enhanced by 20% during local night.
      Enhanced by 20% after local dawn.
   Northern Australian Region:
      Enhanced by 15% during local day.
      Enhanced by 20% 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
Nov      3
Dec      33
Jan      36


2. FORECAST (22 DECEMBER - 24 DECEMBER)
Date   T index  Conditions       MUFs                              
22 Dec    50    Normal           Near to 15% above predicted 
                                 monthly values
23 Dec    50    Normal           Near to 15% above predicted 
                                 monthly values    
24 Dec    50    Normal           Near to 15% above predicted 
                                 monthly values   

COMMENT: SWS HF Communications Warning 41 was issued on 20 December 
and is current for 20-22 Dec. MUFs in the Australian region for 
21 December ranged from near predicted monthly values to slightly 
enhanced by 20% for Equatorial and Northern AUS regions. MUFs 
are expected to be mostly near predicted monthly values to slightly 
enhanced levels to due above average levels of solar ionising 
flux. Shortwave fadeouts possible on daylight HF circuits.

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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
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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