[Ips-dhfpr] SWS Daily HF Prop Report - 13 December 17 issued 2330 UT on 13 Dec 2017 [SEC=UNCLASSIFIED]

[Regional Warning Centre]

SUBJ: SWS DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/13 DECEMBER 2017 BY Space Weather Services
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (13 DECEMBER) 
Date   T index  Conditions    
13 Dec   -28    Normal         

Flares: none.

MUFs:
   Cocos Island Region:
      No data available 
   Niue Island Region:
      Mostly near predicted monthly values.
      Depressed by 25% after local dawn.
   Northern Australian Region:
      Depressed by 15% during local day.
      Depressed by 30% during local night.
   Southern Australian Region:
      Depressed by 25% during local day.
      Near predicted monthly values 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      -5
Dec      4
Jan      4


2. FORECAST (14 DECEMBER - 16 DECEMBER)
Date   T index  Conditions       MUFs                              
14 Dec   -20    Normal           Depressed 15%/near predicted 
                                 monthly values
15 Dec   -15    Normal           Near predicted monthly values    
16 Dec   -10    Normal           Near predicted monthly values   

COMMENT: SWS HF Communications Warning 53 was issued on 12 December 
and is current for 13-14 Dec. Minor to moderate MUF depressions 
were observed across Aus/NZ regions on UT day 13 December. Sporadic 
E blanketing were observed at several low and mid latitude locations. 
Minor to moderate MUF depressions and degradations in HF conditions 
are possible in the region from 14 to 15 December. These depression 
are the aftermath of disturbed conditions associated with the 
coronal hole and as well as the prolonged very low solar activity 
levels.

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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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