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

Regional Warning Centre rwc at ips.gov.au
Wed Dec 19 10:30:22 EST 2018


SUBJ: SWS DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/18 DECEMBER 2018 BY Space Weather Services
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (18 DECEMBER) 
Date   T index  Conditions    
18 Dec   -32    Normal         

Flares: none.

MUFs:
   Niue Island Region:
      Near predicted monthly values during local day.
      Depressed by 35% during local night.
      Depressed by 25% after local dawn.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 15% 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 15% over the UT day.

PCA Event : No event.

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


2. FORECAST (19 DECEMBER - 21 DECEMBER)
Date   T index  Conditions       MUFs                              
19 Dec   -35    Normal           Near predicted monthly values/depressed 
                                 10 to 25%
20 Dec   -35    Normal           Near predicted monthly values/depressed 
                                 10 to 25%    
21 Dec   -35    Normal           Near predicted monthly values/depressed 
                                 10 to 25%   

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

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