[Ips-dhfpr] IPS Daily HF Prop Report - 11 September 07

[rwc]

SUBJ: IPS DAILY HF PROPAGATION REPORT
ISSUED AT 11/2330Z SEPTEMBER 2007 BY IPS RADIO AND SPACE SERVICES
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (11 SEPTEMBER) 
Date   T index  Conditions    
11 Sep     5    Normal         

Flares: none.

MUFs:
   Equatorial PNG/Niue Region:
      Depressed by 30% during local day,
      Near predicted monthly values during local night.
   Northern Australian Region:
      Depressed by 15% during local day,
      Enhanced by 15% during local night.
   Southern Australian and New Zealand Region:
      Near predicted monthly values.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Near predicted monthly values. 

PCA Event : No event.

Predicted Monthly T index for September:  10
2. FORECAST (12 SEPTEMBER - 14 SEPTEMBER)
Date   T index  Conditions       MUFs                              
12 Sep    10    Normal           near predicted monthly values 
13 Sep    10    Normal           near predicted monthly values     
14 Sep     6    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 N.Aus/Equatorial 
regions suffered some strong MUF depressions particularly around 
noon to early afternoon local time. In the absence of solar active 
regions with ionising EUV radiation, the ionosphere is recovering 
slowly from previous geomagnetic activity associated depressions. 
MUFs are expected to return to monthly average values over the 
next 1-2 days. Continuing daytime depressions in the N/Aus/Equatorial 
regions possible. 

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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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