[Ips-dhfpr] SWS Daily HF Prop Report - 17 December 16 issued 2330 UT on 17 Dec 2016 [SEC=UNCLASSIFIED]

[Regional Warning Centre]

SUBJ: SWS DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/17 DECEMBER 2016 BY Space Weather Services
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (17 DECEMBER) 
Date   T index  Conditions    
17 Dec   -17    Poor           

Flares: None

MUFs:
   Cocos Island Region:
      Depressed by 15% during local day.
      Depressed by 25% during local night.
      Depressed by 20% after local dawn.
   Niue Island Region:
      Mostly near predicted monthly values.
   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      3
Dec      24
Jan      23


2. FORECAST (18 DECEMBER - 20 DECEMBER)
Date   T index  Conditions       MUFs                              
18 Dec   -10    Poor             0 to 30% below predicted monthly 
                                 values
19 Dec    -5    Poor-fair        0 to 25% below predicted monthly 
                                 values    
20 Dec    -5    Poor-fair        0 to 25% below predicted monthly 
                                 values   

COMMENT: SWS HF Communications Warning 67 was issued on 15 December 
and is current for 16-18 Dec. Conditions for HF radio wave propagation 
were strongly depressed throughout the Australian region during 
17 Dec UT. Local daily T indices ranged between -30 at Norfolk 
Island and 1 at Niue. Depressed conditions are likely to continue 
in coming days. 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
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Haymarket NSW 1240  AUSTRALIA       FTP: ftp://ftp-out.sws.bom.gov.au
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