[Ips-dhfpr] SWS Daily HF Prop Report - 18 December 17 issued 2343 UT on 18 Dec 2017 [SEC=UNCLASSIFIED]

[rwc]

SUBJ: SWS DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/18 DECEMBER 2017 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   -23    Fair-normal    

Flares: none.

MUFs:
   Cocos Island Region:
      No data available.
   Niue Island Region:
      Near predicted monthly values during local day.
      Depressed by 25% during local night.
      Depressed by 20% after local dawn.
   Northern Australian Region:
      Depressed by 20% during local day.
      Near predicted monthly values during local night.
   Southern Australian Region:
      Depressed by 20% during local day.
      Depressed by 15% 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      -5
Dec      4
Jan      4


2. FORECAST (19 DECEMBER - 21 DECEMBER)
Date   T index  Conditions       MUFs                              
19 Dec   -20    Fair             Near predicted monthly values/depressed 
                                 10 to 30%
20 Dec   -20    Fair             Near predicted monthly values/depressed 
                                 10 to 30%    
21 Dec   -20    Fair             Near predicted monthly values/depressed 
                                 10 to 30%   

COMMENT: SWS HF Communications Warning 54 was issued on 18 December 
and is current for 18-19 Dec. Minor MUF depressions to near monthly 
predicted MUFs were observed across Aus/NZ regions on UT day 
18 Dec. Incidence of Sporadic E blanketing were mostly confined 
to Southern Australian regions. Similar HF conditions with Minor 
to Moderate MUF depressions expected for the next three days.

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