[Ips-dhfpr] IPS Daily HF Prop Report - 20 July 07

[rwc]

SUBJ: IPS DAILY HF PROPAGATION REPORT
ISSUED AT 20/2330Z JULY 2007 BY IPS RADIO AND SPACE SERVICES
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (20 JULY) 
Date   T index  Conditions    
20 Jul     6    Normal-fair    

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 15% 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 25% during local night.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Near predicted monthly values / Enhanced by 15%.

PCA Event : No event.

Predicted Monthly T index for July:  10
2. FORECAST (21 JULY - 23 JULY)
Date   T index  Conditions       MUFs                              
21 Jul     8    Normal           near predicted monthly values 
22 Jul     4    Normal           near predicted monthly values/depressed 
                                 10 to 20%     
23 Jul     0    Normal           near predicted monthly values/depressed 
                                 10 to 20%    

COMMENT: Enhanced geomagnetic activity resulted in variable and 
often degraded HF conditions in the S.Aus/NZ/Antarctic regions 
on 20 Jul. MUFs however showed a limited recovery over the last 
few days of depressions due to a positive winter response to 
Ap. The ionosphere in the Australian region is expected to be 
much the same 21 Jul as elevated geomagnetic activity continues 
at a lower level. Further depressions, up to 20%, are likely 
from 22 July. Night time spread-F observed in the S.Aus/NZ region 
is also expected to continue 21 Jul. 

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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.

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