[Ips-dhfpr] IPS Daily HF Prop Report - 20 December 15 issued 2340 UT on 20 Dec 2015 [SEC=UNCLASSIFIED]

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SUBJ: SWS DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/20 DECEMBER 2015 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   105    Normal         

Flares: none.

MUFs:
   Cocos Island Region:
      Enhanced by 15% during local day.
      Enhanced by 20% during local night.
   Niue Island Region:
      Near predicted monthly values during local day.
      Enhanced by 25% during local night.
      Depressed by 35% after local dawn.
   Northern Australian Region:
      Enhanced by 25%.
      Depressed by 25% after local dawn.
   Southern Australian Region:
      Mostly near predicted monthly values.
      Depressed by 35% after local dawn.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Near predicted monthly values over the UT day
      with extended periods of disturbance.

PCA Event : No event.

Monthly T index:
Month  T index
Nov      55
Dec      63
Jan      63


2. FORECAST (21 DECEMBER - 23 DECEMBER)
Date   T index  Conditions       MUFs                              
21 Dec    30    Fair             15 to 20% below predicted monthly 
                                 values
22 Dec    40    Normal           Depressed 15%/near predicted 
                                 monthly values    
23 Dec    60    Normal           Near predicted monthly values   

COMMENT: IPS HF Communications Warning 81 was issued on 20 December 
and is current for 21 Dec only. Moderately to strongly enhanced 
ionospheric conditions observed throughout the region early on 
Dec 20 following onset of significant geomagnetic activity. As 
a further consequence of that ongoing activity, widespread moderate 
depressions have been observed after local dawn on Dec 21. Ongoing 
geomagnetic activity on day one may result in moderately depressed 
ionospheric conditions in the Australasian region. Expect a gradual 
return to mostly normal MUF support by day three.

----------------------------------------------------------
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 ips.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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