[Ips-dhfpr] IPS Daily HF Prop Report - 26 September 06

[rwc]

SUBJ: IPS DAILY HF PROPAGATION REPORT
ISSUED AT 26/2330Z SEPTEMBER 2006 BY IPS RADIO AND SPACE SERVICES
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (26 SEPTEMBER) 
Date   T index  Conditions    
26 Sep     0    Normal         

Flares: none.

MUFs:
slightly below predicted monthly values

PCA Event : No event.

Predicted Monthly T index for September:  11
2. FORECAST (27 SEPTEMBER - 29 SEPTEMBER)
Date   T index  Conditions       MUFs                              
27 Sep     4    Normal           about 5% below predicted monthly 
                                 values 
28 Sep     8    Normal           0 to 5% below predicted monthly 
                                 values     
29 Sep    12    Normal           Near predicted monthly values    
COMMENT: Equatorial latitudes (DWN, PNG, Niue, Nth QLD) have 
again shown ionospheric depressions, particularly during the 
local afternoon when the F2 region was greatly reduced. An HF 
warning was issued yesterday and similar conditions may re-occur 
on the 27th, although not expected to be as deep. This depletion 
is presumed due to enhanced geomagnetic activity from high solar-wind 
speed. The equatorial fountain effect draws F2 region ionisation 
out from 15-20deg either side of the geomagnetic equator up the 
geomagnetic field lines. Mid-latitudes appear to be almost back 
to normal. The polar ionosphere is becoming disturbed due to 
IMF BZ southward conditions coupled with high Vsw and density. 
Sub-auroral oval regions (MQI, MAW) appear to be undergoing significant 
radio absorption, especially in the southern ocean (MQI) since 
on the Macquarie Is riometer since ~2130UT. 
----------------------------------------------------------
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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