[Ips-dhfpr] SWS Daily HF Prop Report - 19 December 18 issued 2330 UT on 19 Dec 2018 [SEC=UNCLASSIFIED]

[Regional Warning Centre]

SUBJ: SWS DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/19 DECEMBER 2018 BY Space Weather Services
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (19 DECEMBER) 
Date   T index  Conditions    
19 Dec   -15    Normal         

Flares: none.

MUFs:
   Niue Island Region:
      Mostly near predicted monthly values.
      Depressed by 25% after local dawn.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 20% during local night.
   Southern Australian Region:
      Depressed by 15% during local day.
      Near predicted monthly values during local night.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Depressed by 20% over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
Nov      -32
Dec      -8
Jan      -9


2. FORECAST (20 DECEMBER - 22 DECEMBER)
Date   T index  Conditions       MUFs                              
20 Dec   -20    Normal           Near predicted monthly values/depressed 
                                 10 to 20%
21 Dec   -20    Normal           Near predicted monthly values/depressed 
                                 10 to 20%    
22 Dec   -20    Normal           Near predicted monthly values/depressed 
                                 10 to 20%   

COMMENT: SWS HF Communications Warning 29 was issued on 17 December 
and is current for 18-20 Dec. On UT day 19 December, there were 
near predicted values to minor MUF depressions across the Australian 
region. Sporadic E layers were seen across the Australian region 
and in Antarctica. Near predicted to moderate depressions are 
expected for the next three days, as a consequence of the continued 
very low levels of ionising radiation from the Sun.

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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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