[Ips-dhfpr] ASWFC Daily HF Prop Report - 20 December 22 issued 2331 UT on 20 Dec 2022 [SEC=OFFICIAL]

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/20 DECEMBER 2022
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (20 DECEMBER) 
Date   T index  Conditions    
20 Dec    76    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M1.1    1407UT  possible   lower  South American/
                                    Atlantic

MUFs:
   Cocos Island Region:
      Near predicted monthly values.
   Niue Island Region:
      Near predicted monthly values during local day.
      Enhanced by 15% during local night.
   Northern Australian Region:
      Mostly near predicted monthly values.
      Enhanced by 25% after local dawn.
   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      77
Dec      70
Jan      70


2. FORECAST (21 DECEMBER - 23 DECEMBER)
Date   T index  Conditions       MUFs                              
21 Dec    70    Normal-fair      Near predicted monthly values
22 Dec    70    Normal           Near predicted monthly values    
23 Dec    70    Normal           Near predicted monthly values   

COMMENT: ASWFC SWF HF Communications Warning 101 was issued on 
18 December and is current for 19-21 Dec. Maximum usable frequencies 
(MUFs) in the Australian region on UT day 20-Dec were mostly 
near predicted monthly values to 25% enhanced in the northern 
Australian sites after local dawn. Significant sporadic-E was 
observed at most sites during local night hours. MUFs are expected 
to be near monthly predicted values over 21-23 Dec, and degraded 
conditions due to persistent sporadic-E are likely to continue 
during the period. 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