[Ips-dhfpr] SWS Daily HF Prop Report - 14 December 18 issued 2335 UT on 14 Dec 2018 [SEC=UNCLASSIFIED]

[rwc]

SUBJ: SWS DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/14 DECEMBER 2018 BY Space Weather Services
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (14 DECEMBER) 
Date   T index  Conditions    
14 Dec   -50    Normal         

Flares: none.

MUFs:
   Cocos Island Region:
      No data available during local day.
      No data available during local night.
   Niue Island Region:
      Near predicted monthly values during local day.
      Depressed by 40% during local night.
      Depressed by 25% after local dawn.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 35% during local night.
   Southern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 25% during local night.
   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      -32
Dec      -8
Jan      -9


2. FORECAST (15 DECEMBER - 17 DECEMBER)
Date   T index  Conditions       MUFs                              
15 Dec   -40    Normal           Depressed 15 to 35%/near predicted 
                                 monthly values
16 Dec   -30    Normal           Depressed 15 to 30%/near predicted 
                                 monthly values    
17 Dec   -30    Normal           Depressed 15 to 30%/near predicted 
                                 monthly values   

COMMENT: SWS HF Communications Warning 26 was issued on 13 December 
and is current for 14-15 Dec. On UT day 14 December, there were 
minor to moderate MUF depressions across the Australian region 
as compared to the monthly predicted levels, with some severe 
MUF depressions during the local night in the Niue Island, Northern 
Australian, and Central Australian regions. Sporadic E layers 
were seen across the Australian region and in Antarctica. Similar 
conditions are expected for UT day, 15 December, as a consequence 
of the continued very low levels of ionising radiation from the 
Sun. Depressions may lessen on UT day, 16 December, in response 
to possible geomagnetic activity due to an approaching coronal 
hole.

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