[Ips-dhfpr] SWS Daily HF Prop Report - 25 December 17 issued 2330 UT on 25 Dec 2017 [SEC=UNCLASSIFIED]

Regional Warning Centre rwc at ips.gov.au
Tue Dec 26 10:30:25 EST 2017


SUBJ: SWS DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/25 DECEMBER 2017 BY Space Weather Services
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (25 DECEMBER) 
Date   T index  Conditions    
25 Dec   -16    Normal-fair    

Flares: none.

MUFs:
   Cocos Island Region:
      No data available.
   Niue Island Region:
      Depressed by 25% during local day.
      Depressed by 20% during local night.
   Northern Australian Region:
      Depressed by 15% during local day.
      Near predicted monthly values 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 (26 DECEMBER - 28 DECEMBER)
Date   T index  Conditions       MUFs                              
26 Dec   -15    Normal           Near predicted monthly values
27 Dec   -10    Normal           Near predicted monthly values    
28 Dec     0    Normal           Near predicted monthly values   

COMMENT: SWS HF Communications Warning 55 was issued on 24 December 
and is current for 25-26 Dec. Minor to moderate MUF depressions 
were observed across Aus/NZ regions on UT day 25 December. Incidence 
of Sporadic E blanketing were mostly confined to Southern Australian 
regions. The two day outlook (26-27 Dec) is for MUFs to be between 
slightly depressed and near monthly predicted levels as the ionosphere 
slowly recovers from the disturbed conditions associated with 
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
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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