[Ips-dhfpr] SWS Daily HF Prop Report - 20 December 16 issued 2330 UT on 20 Dec 2016 [SEC=UNCLASSIFIED]

[Regional Warning Centre]

SUBJ: SWS DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/20 DECEMBER 2016 BY Space Weather Services
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (20 DECEMBER) 
Date   T index  Conditions    
20 Dec     2    Normal-fair    

Flares: none.

MUFs:
   Cocos Island Region:
      Mostly near predicted monthly values.
   Niue Island Region:
      Near predicted monthly values.
   Northern Australian Region:
      Depressed by 30% 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):
      Near predicted monthly values over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
Nov      3
Dec      24
Jan      23


2. FORECAST (21 DECEMBER - 23 DECEMBER)
Date   T index  Conditions       MUFs                              
21 Dec    -5    Normal-poor      20 to 30% below predicted monthly 
                                 values
22 Dec   -15    Fair-poor        20 to 40% below predicted monthly 
                                 values    
23 Dec   -15    Fair-poor        20 to 40% below predicted monthly 
                                 values   

COMMENT: SWS HF Communications Warning 68 was issued on 18 December 
and is current for 19-21 Dec. Minor to moderate MUF depressions 
were observed in Aus/NZ regions today. Depressed conditions are 
likely to continue in coming days as geomagnetic activity is 
expected to rise from today and the level of ionising radiation 
is not expected to show any significant increases. Lowering the 
operating frequency may result in propagation via sporadic E 
layers when present.

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