[Ips-dhfpr] IPS Daily HF Prop Report - 27 December 07

[rwc]

SUBJ: IPS DAILY HF PROPAGATION REPORT
ISSUED AT 27/2330Z DECEMBER 2007 BY IPS RADIO AND SPACE SERVICES
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (27 DECEMBER) 
Date   T index  Conditions    
27 Dec   -19    Poor-fair      

Flares: none.

MUFs:
   Equatorial PNG/Niue Region:
      Near predicted monthly values during local day,
      Depressed by 20% during local night.
   Northern Australian Region:
      Depressed by up to 30% over UT day. 
   Southern Australian and New Zealand Region:
      Depressed by 15% over UT day. 
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Depressed by 15% during local day,
      Near predicted monthly values during local night.

PCA Event : No event.

Predicted Monthly T index for December:   5
2. FORECAST (28 DECEMBER - 30 DECEMBER)
Date   T index  Conditions       MUFs                              
28 Dec   -25    Poor-fair        10 to 30% below predicted monthly 
                                 values 
29 Dec   -30    Poor-fair        10 to 30% below predicted monthly 
                                 values     
30 Dec   -30    Poor-fair        10 to 30% below predicted monthly 
                                 values    

COMMENT: IPS HF Communications Warning 46 was issued on 26 December 
and is current for interval 27-29 December. MUF depressions of 
up to 30% were observed at times across the Australian region 
over the past 24 hours, particularly during local day. Widespread 
and often blanketing Sporadic-E was again observed across the 
Australian region over the UT day degrading HF propagation conditions. 
Continuing MUF depressions are expected over the next few days 
due to very low levels of solar activity, with significant depressions 
possible at times. Continuing sporadic-E expected at mid latitudes. 

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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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