[Ips-dhfpr] IPS Daily HF Prop Report - 10 September 08

[rwc]

SUBJ: IPS DAILY HF PROPAGATION REPORT
ISSUED AT 10/2330Z SEPTEMBER 2008 BY IPS RADIO AND SPACE SERVICES
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (10 SEPTEMBER) 
Date   T index  Conditions    
10 Sep     1    Normal         

Flares: none.

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

PCA Event : No event.

Predicted Monthly T index for September:   2
2. FORECAST (11 SEPTEMBER - 13 SEPTEMBER)
Date   T index  Conditions       MUFs                              
11 Sep     1    Normal           about 5% below predicted monthly 
                                 values 
12 Sep     1    Normal           Near predicted monthly values     
13 Sep    -3    Normal           about 10% below predicted monthly 
                                 values    
COMMENT: MUF values across Australian/NZ regions were again slightly 
below average at mid-latitudes, mainly due to the lack of sunpots 
and corresponding EUV radiation, which would speed recovery of 
the ionosphere from the geomagnetic supression by the recent 
solar coronal hole. There were again both large depressions and 
enhancements at equatorial latitudes (Cocos Is, Vanimo, Niue). 
Sub-equatorial sites (Darwin, Learmonth) also had the same pattern 
but weaker and some daytime spread F.There was again a slight 
dusk/night depletion across mid-latitudes. Conditions are expected 
to be normal to slightly depressed compared with predicted monthly 
T values for the next 2-3 days and a recurrent coronal hole should 
take effect ~14th Sept, increasing geomag activity and decreasing 
MUFs. 
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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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