[Ips-dhfpr] IPS Daily HF Prop Report - 29 June 08

[rwc]

SUBJ: IPS DAILY HF PROPAGATION REPORT
ISSUED AT 29/2330Z JUNE 2008 BY IPS RADIO AND SPACE SERVICES
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (29 JUNE) 
Date   T index  Conditions    
29 Jun     1    Normal         

Flares: none.

MUFs:
   Equatorial PNG/Niue Region:
      Depressed by 25% during local day,
      Near predicted monthly values during local night.
   Northern Australian Region:
      Mostly near predicted monthly values,
   Southern Australian and New Zealand Region:
      Near predicted monthly values.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Enhanced by 65% over the UT day.

PCA Event : No event.

Predicted Monthly T index for June:   5
2. FORECAST (30 JUNE - 02 JULY)
Date   T index  Conditions       MUFs                              
30 Jun     0    Normal           5 to 10% below predicted monthly 
                                 values 
01 Jul     0    Normal           5 to 10% below predicted monthly 
                                 values     
02 Jul     0    Normal           5 to 10% below predicted monthly 
                                 values    
COMMENT: Australasian region HF conditions were mostly normal 
in terms of MUF in the last 24h, albeit with daytime depressions 
for the Equatorial and western Pacific. Spread-F was prevalent 
at many sites, possibly degrading propagation quality. T-index 
remains slightly below predicted monthly average and expected 
to remain so for the next few days as geomagnetic activity subsides 
and the absence of sunspots with ionising EUV radiation. Antarctic 
ionosphere was strongly enhanced in MUF, probably due to, the 
weak background ionosphere during nil sunlight in winter, the 
enhanced convection due to coronal hole high-speed solar-wind 
stream drawing in ionisation from sunlit areas equatorward into 
the polar cap. 
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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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