[Ips-dhfpr] IPS Daily HF Prop Report - 26 December 07

[rwc]

SUBJ: IPS DAILY HF PROPAGATION REPORT
ISSUED AT 26/2330Z DECEMBER 2007 BY IPS RADIO AND SPACE SERVICES
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (26 DECEMBER) 
Date   T index  Conditions    
26 Dec   -28    Poor-normal    

Flares: none.

MUFs:
   Equatorial PNG/Niue Region:
      Near predicted monthly values during local day,
      Depressed by 15% during local night.
      Depressed by 30% after local dawn.
   Northern Australian Region:
      Depressed by 20% during local day,
      Depressed by 40% during local night.
   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:   5
2. FORECAST (27 DECEMBER - 29 DECEMBER)
Date   T index  Conditions       MUFs                              
27 Dec   -35    Poor-normal      10 to 30% below predicted monthly 
                                 values 
28 Dec   -37    Poor-normal      10 to 30% below predicted monthly 
                                 values     
29 Dec   -40    Poor-normal      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 40% were observed at times across the Australian region 
over the past 24 hours, particularly after dawn and during local 
night. Widespread and often blanketing Sporadic-E was also 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 
likely at mid and low 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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