[Ips-dhfpr] SWS Daily HF Prop Report - 15 December 21 issued 2331 UT on 15 Dec 2021

[Regional Warning Centre]

SUBJ: SWS DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/15 DECEMBER 2021 BY Space Weather Services
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (15 DECEMBER) 
Date   T index  Conditions    
15 Dec    21    Normal         

Flares: none.

MUFs:
   Cocos Island Region:
      Near predicted monthly values.
   Niue Island Region:
      Mostly near predicted monthly values.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 15% during local night.
   Southern Australian Region:
      Mostly 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 (16 DECEMBER - 18 DECEMBER)
Date   T index  Conditions       MUFs                              
16 Dec    20    Fair-normal      Near predicted monthly values
17 Dec    20    Fair-normal      Near predicted monthly values    
18 Dec    20    Normal           Near predicted monthly values   

COMMENT: SWS SWF HF Communications Warning 40 was issued on 15 
December and is current for 15-17 Dec. MUFs in the Australian 
region on UT day 15 December were mostly near predicted monthly 
values with some occasional moderate depressions. Some sporadic 
E observed local night hours, with strong sporadic E observed 
at Hobart. MUFs are expected to be mostly near predicted monthly 
values, with occasional mild depressions of 15% for 16-18 December. 
There is a chance for shortwave fadeouts on daylight HF circuits 
over the next few days.

----------------------------------------------------------
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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