[Ips-dhfpr] IPS Daily HF Prop Report - 12 December 09

[rwc]

SUBJ: IPS DAILY HF PROPAGATION REPORT
ISSUED AT 12/2330Z DECEMBER 2009 BY IPS RADIO AND SPACE SERVICES
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (12 DECEMBER) 
Date   T index  Conditions    
12 Dec   -33    Normal         

Flares: none.

MUFs:
   Cocos Island Region:
      Depressed by 20% during local day,
      Near predicted monthly values during local night.
   Niue Island Region:
      Depressed by 30% during local day,
      Depressed by 20% during local night.
   Northern Australian Region:
      Depressed by 15% during local day,
      Near predicted monthly values during local night.
   Southern Australian and New Zealand Region:
      Depressed by 15% 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.

Predicted Monthly T index for December:   1
2. FORECAST (13 DECEMBER - 15 DECEMBER)
Date   T index  Conditions       MUFs                              
13 Dec   -25    Normal           near predicted monthly values/depressed 
                                 10 to 20% 
14 Dec   -25    Normal           near predicted monthly values/depressed 
                                 10 to 20%     
15 Dec   -20    Normal           near predicted monthly values/depressed 
                                 10 to 20%    

COMMENT: Increased solar and geomagnetic activity over the last 
24 hours resulted in a strengthening of ionospheric support for 
HF. HF conditions also improved over that of the previous few 
days. MUFs however remain consistently depressed relative to 
expected monthly values and this is expected to persist for at 
least the next 3 days due to seasonal conditions and low solar 
activity. There may be some gradual improvement as solar active 
regions currently near the east limb rotate further onto the 
visible disk, however these active regions are weak and likely 
to provide only slight improvement to ionospheric conditions. 

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For an explanation of some of the terms in this report, go to
http://www.ips.gov.au, and follow links to Educational->
Glossary on Solar Terrestrial Terms.

IPS Radio and Space Services        email: asfc at ips.gov.au
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Haymarket NSW 1240  AUSTRALIA       FTP: ftp://ftp.ips.gov.au 
tel: +61 2 9213 8010                fax: +61 2 9213 8060 

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