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

[rwc]

SUBJ: IPS DAILY HF PROPAGATION REPORT
ISSUED AT 09/2330Z DECEMBER 2009 BY IPS RADIO AND SPACE SERVICES
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (09 DECEMBER) 
Date   T index  Conditions    
09 Dec   -39    Normal-fair    

Flares: none.

MUFs:
   Cocos Island Region:
      Depressed by 15% during local day,
      Depressed by 15% during local night.
   Niue Island Region:
      Depressed by 15% during local day,
      Near predicted monthly values during local night.
   Northern Australian Region:
      Depressed by 25% during local day,
      Depressed by 25% during local night.
      Depressed by 20% after local dawn.
   Southern Australian and New Zealand Region:
      Near predicted monthly values during local day,
      Depressed by 20% 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 (10 DECEMBER - 12 DECEMBER)
Date   T index  Conditions       MUFs                              
10 Dec   -35    Normal-fair      15 to 30% below predicted monthly 
                                 values 
11 Dec   -30    Normal           15 to 30% below predicted monthly 
                                 values     
12 Dec   -25    Normal           10 to 20% below predicted monthly 
                                 values    

COMMENT: IPS HF Communications Warning 9 was issued on 9 December 
and is current for interval 10-12 December. MUFs were again consistently 
depressed across the Australian region over the day, particularly 
at mid-low latitudes (N.Aus). HF conditions were variable with 
some sporadic E-layer observed at a number of stations, particularly 
in the early evening. Ionospheric support is expected to continue 
to be depressed for at least the next three days due to continuing 
weak solar activity, although there should be some gradual improvement 
as solar active regions currently on the east limb rotate further 
onto the visible disk. 

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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 
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