[Ips-dhfpr] IPS Daily HF Prop Report - 18 December 07

[rwc]

SUBJ: IPS DAILY HF PROPAGATION REPORT
ISSUED AT 18/2330Z DECEMBER 2007 BY IPS RADIO AND SPACE SERVICES
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (18 DECEMBER) 
Date   T index  Conditions    
18 Dec   -16    Normal-fair    

Flares: none.

MUFs:
   Equatorial PNG/Niue Region:
      Near predicted monthly values during local day,
      Depressed by 15% during local night.
   Northern Australian Region:
      Mostly near predicted monthly values,
      Depressed by 25% after local dawn.
   Southern Australian and New Zealand Region:
      Depressed up to 30% at times during the local day,
      otherwise mostly near predicted monthly values,
   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:   5
2. FORECAST (19 DECEMBER - 21 DECEMBER)
Date   T index  Conditions       MUFs                              
19 Dec   -15    Normal-fair      depressed 10 to 20%/near predicted 
                                 monthly values 
20 Dec   -15    Normal-fair      depressed 10 to 20%/near predicted 
                                 monthly values     
21 Dec   -15    Normal-fair      depressed 10 to 20%/near predicted 
                                 monthly values    
COMMENT: IPS HF Communications Warning 42 was issued on 18 December 
and is current for interval 19 December only. Mild depressions 
were observed at times across the Australian region over the 
past 24 hours. Sporadic-E and Spread-F conditions were also observed 
at times across the Australian region over the past 24 hours 
which may have contributed to degraded HF conditions. Mild depressions 
are expected over the next few days due to declining solar activity. 
----------------------------------------------------------
For an explanation of some of the terms in this report, goto
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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