[Ips-dhfpr] IPS Daily HF Prop Report - 10 September 07

[rwc]

SUBJ: IPS DAILY HF PROPAGATION REPORT
ISSUED AT 10/2330Z SEPTEMBER 2007 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:
      Depressed by 20% during local day,
      Near predicted monthly values during local night.
   Northern Australian Region:
      Depressed by 20% during local day,
      Near predicted monthly values during local night.
   Southern Australian and New Zealand Region:
      Near predicted monthly values during local day,
      Enhanced by 15% during local night.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Near predicted monthly values.

PCA Event : No event.

Predicted Monthly T index for September:  10
2. FORECAST (11 SEPTEMBER - 13 SEPTEMBER)
Date   T index  Conditions       MUFs                              
11 Sep     5    Normal           5 to 10% below predicted monthly 
                                 values 
12 Sep    10    Normal           near predicted monthly values     
13 Sep    10    Normal           near predicted monthly values    

COMMENT: Spread F observed at some Southern Australian latitudes 
overnight which may degrade HF comms by multipath if re-occurring. 
Advisable to check ionograms for station near reflection point 
of the HF circuit http://www.ips.gov.au/HF_Systems/1/3 Middle 
and Low latitudes suffering daytime depressions as the ionosphere 
slowly recovers from previous geomagnetic activity. Expect a 
slowly recovering ionosphere to return to the monthly average 
over the next 2 days. The lack of solar active regions with ionising 
EUV radiation will make this recovery slow. 

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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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