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

[Regional Warning Centre]

SUBJ: SWS DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/16 DECEMBER 2016 BY Space Weather Services
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (16 DECEMBER) 
Date   T index  Conditions    
16 Dec   -29    Poor           

Flares: B class flares

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Depressed by 25% during local night.
      Depressed by 20% after local dawn.
   Niue Island Region:
      Depressed by 30% during local day.
      Depressed by 35% during local night.
   Northern Australian Region:
      Depressed by 35% during local day.
      Depressed by 30% during local night.
   Southern Australian Region:
      Depressed by 15% 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 (17 DECEMBER - 19 DECEMBER)
Date   T index  Conditions       MUFs                              
17 Dec   -15    Poor             0 to 35% below predicted monthly 
                                 values
18 Dec   -10    Poor-fair        0 to 30% below predicted monthly 
                                 values    
19 Dec   -10    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 
16 Dec UT. Local daily T indices ranged between -50 at Niue and 
-6 at Perth. The strong depressions seem unrelated to recent 
geomagnetic activity and 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
tel: +61 2 9213 8010                fax: +61 2 9213 8060 

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