[Ips-dhfpr] IPS Daily HF Prop Report - 27 July 06

[rwc]

SUBJ: IPS DAILY HF PROPAGATION REPORT
ISSUED AT 27/2330Z JULY 2006 BY IPS RADIO AND SPACE SERVICES
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (27 JULY) 
Date   T index  Conditions    
27 Jul    21    Normal         

Flares: none.

MUFs:
about 10% above predicted monthly values

PCA Event : No event.

Predicted Monthly T index for July:  13
2. FORECAST (28 JULY - 30 JULY)
Date   T index  Conditions       MUFs                              
28 Jul    20    Normal           about 10% above predicted monthly 
                                 values 
29 Jul    17    Normal           near predicted monthly values     
30 Jul    18    Normal           about 5% above predicted monthly 
                                 values    
COMMENT: Overall conditions are still enhanced across the region, 
less than yesterday. Equatorial (northern) latitudes still show 
strong enhancements around dusk, followed by night-time depletions 
due to equatorial mechanisms. Slightly higher ionising X-ray 
flux from solar AR901 to enhance the ionisphere will be competing 
with increased geomagnetic activity from a coronal hole solar 
wind speed increase, trying to depress the ionosphere. The nett 
result is likely to be a still slightly enhance condition. High 
latitudes are likely to be very disturbed for the next day or 
two due to IMF Bz southwards causing merging with the geomag 
field and enhancing ionospheric convection, coupled with the 
effects of the shock front at 13UT and increased solar wind speeds/densities. 
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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->
Gloassary on Solar Terrestrial Terms.

IPS Radio and Space Services        email: asfc at ips.gov.au
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