[Ips-dhfpr] IPS Daily HF Prop Report - 20 December 03

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SUBJ: IPS DAILY HF PROPAGATION REPORT
ISSUED AT 20/2330Z DECEMBER 2003 BY IPS RADIO AND SPACE SERVICES
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (20 DECEMBER) 
Date   T index  Conditions    
20 Dec    74    Normal         

Flares: none.

MUFs:
   Equatorial PNG Region:
      Near predicted monthly values during local day,
      Depressed by 15% during local night.
   Northern Australian Region:
      Enhanced by 15% during local day,
      Enhanced by 40% during local night.
      Depressed by 10% after local dawn.
   Southern Australian and New Zealand Region:
      Enhanced by 15% during local day/night,
      Depressed by 10% after local dawn.
   Antarctic Region (Casey/Scott Base):
      Near predicted monthly values over the UT day
      with increasing periods of disturbance.


PCA Event : No event.

Predicted Monthly T index for December:  50
2. FORECAST (21 DECEMBER - 23 DECEMBER)
Date   T index  Conditions       MUFs                              
21 Dec    20    Normal-Fair      Near predicted monthly values 
                                 equatorial/N Aus, Depressed 
                                 10 to 30% S Aus/NZ/Antarctic 
                                 regions. 
22 Dec    40    Normal-Fair      Near predicted monthly values/depressed 
                                 5 to 10%.     
23 Dec    60    Normal           Near predicted monthly values.    
COMMENT: IPS HF Communications Warning 98 was issued on 20 December 
and is current for interval 21 December only. Generally enhanced 
HF propagation conditions observed, prior to onset of coronal 
hole wind stream effects. Spread-F conditions and periods of 
disturbance observed in Antarctic regions. Mild depressions observed 
today after local dawn in Aus/NZ regions. Expect periods of disturbance 
next two days at mid to high latitudes due to continuing coronal 
hole wind stream effects. HF conditions should improve by day 
three. 

IPS Radio and Space Services      | email: asfc at ips.gov.au
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