[Ips-dhfpr] IPS Daily HF Prop Report - 21 July 07

[rwc]

SUBJ: IPS DAILY HF PROPAGATION REPORT
ISSUED AT 21/2330Z JULY 2007 BY IPS RADIO AND SPACE SERVICES
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (21 JULY) 
Date   T index  Conditions    
21 Jul     8    Normal-fair    

Flares: none.

MUFs:
   Equatorial PNG/Niue Region:
      Mostly near predicted monthly values,
   Northern Australian Region:
      Near predicted monthly values.
   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.

PCA Event : No event.

Predicted Monthly T index for July:  10
2. FORECAST (22 JULY - 24 JULY)
Date   T index  Conditions       MUFs                              
22 Jul     6    Normal           near predicted monthly values/depressed 
                                 10 to 20% 
23 Jul     2    Normal           10 to 20% below predicted monthly 
                                 values     
24 Jul     0    Normal           10 to 20% below predicted monthly 
                                 values    

COMMENT: Continuing enhanced geomagnetic activity resulted in 
variable degraded HF conditions in the S.Aus/ NZ/Antarctic regions 
on 21 Jul. Strong sporadic E layers were observed at Vanimo and 
Hobart. MUFs however remained near predicted monthly values as 
the winter ionosphere responded positively to the enhanced 
geomagnetic activity. The ionosphere is expected to become 
depressed over the next 2-3 days as the geomagnetic activity 
subsides and the F10.7 solar flux continues to fall. MUF 
depressions up to 20% are possible. Night time spread-F observed 
in the S.Aus/NZ region is also expected to continue 22 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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