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

[rwc]

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

1. SUMMARY (20 NOVEMBER) 
Date   T index  Conditions    
20 Nov   -27    Normal-fair    

Flares: none.

MUFs:
   Equatorial PNG/Niue Region:
      Depressed by 20% during local day,
      Depressed by 35% during local night.
   Northern Australian Region:
      Near predicted monthly values during local day,
      Enhanced by 15% during local night,
      Depressed by 30% after local dawn.
   Southern Australian and New Zealand Region:
      Near predicted monthly values during local day,
      Depressed by 25% during local night.
      Depressed by 30% after local dawn.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Depressed by 15% over the UT day.

PCA Event : No event.

Predicted Monthly T index for November:  11
2. FORECAST (21 NOVEMBER - 23 NOVEMBER)
Date   T index  Conditions       MUFs                              
21 Nov   -30    Normal-Fair      15 to 30% below predicted monthly 
                                 values 
22 Nov   -30    Normal           15 to 30% below predicted monthly 
                                 values     
23 Nov   -35    Normal           15 to 30% below predicted monthly 
                                 values    

COMMENT: IPS HF Communications Warning 32 was issued on 20 November 
and is current for interval 21-22 November. Widespread depressions 
in MUFs continued across the Australian/ NZ/SW-Pacific region 
due to lack of solar ionisation. The arrival of a coronal hole 
wind stream late on 19 Nov increased geomagnetic activity producing 
a short-lived enhancement in ionospheric ionisation, particularly 
evident as a 20% enhancement in mid-latitude MUFs after 0700 
UT. This MUF enhancement is expected to be short lived with a 
return to pre-coronal hole depressions from 21 Nov and for the 
next three days. Expect degraded HF conditions 21 Nov due to 
continuing enhanced geomagnetic activity. 

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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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