[Ips-dhfpr] SWS Daily HF Prop Report - 27 December 16 issued 2330 UT on 27 Dec 2016 [SEC=UNCLASSIFIED]

[Regional Warning Centre]

SUBJ: SWS DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/27 DECEMBER 2016 BY Space Weather Services
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (27 DECEMBER) 
Date   T index  Conditions    
27 Dec    -3    Normal-fair    

Flares: none.

MUFs:
   Cocos Island Region:
      Depressed by 25% during local day.
      Depressed by 20% during local night.
   Niue Island Region:
      Mostly near predicted monthly values.
   Northern Australian Region:
      Depressed by 15% during local day.
      Near predicted monthly values during local night.
   Southern Australian Region:
      Depressed by 30% during local day.
      Depressed by 15% 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 (28 DECEMBER - 30 DECEMBER)
Date   T index  Conditions       MUFs                              
28 Dec     0    Normal           Depressed 15%/near predicted 
                                 monthly values
29 Dec     5    Normal           Near predicted monthly values    
30 Dec    10    Normal           Near predicted monthly values   

COMMENT: SWS HF Communications Warning 70 was issued on 26 December 
and is current for 27-28 Dec. Minor to moderate depressions in 
MUFs occurred over most Australian regions on UT day 27 December, 
with depressions even extending into the equatorial regions. 
These are thought to be due to loss in ionisation levels associated 
with active conditions observed on UT day 26 December associated 
with the coronal hole. The outlook for today 28 December is for 
similar MUF conditions as the ionosphere gradually recovers from 
the substorm effects. HF support are expected to return to near 
monthly predicted levels from late 29 December. HF users are 
advised to use lower than the monthly predicted frequencies today, 
28 December.

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