[Ips-dhfpr] IPS Daily HF Prop Report - 18 December 03

[rwc]

SUBJ: IPS DAILY HF PROPAGATION REPORT
ISSUED AT 18/2330Z DECEMBER 2003 BY IPS RADIO AND SPACE SERVICES
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (18 DECEMBER) 
Date   T index  Conditions    
18 Dec    88    Normal         

Flares: none.

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


PCA Event : No event.

Predicted Monthly T index for December:  50
2. FORECAST (19 DECEMBER - 21 DECEMBER)
Date   T index  Conditions       MUFs                              
19 Dec    80    Normal           10 to 20% above predicted monthly 
                                 values 
20 Dec    45    Normal-Fair      near predicted monthly values/depressed 
                                 5 to 10%     
21 Dec    45    Normal-Fair      near predicted monthly values/depressed 
                                 5 to 10%    
COMMENT: IPS HF Communications Warning 97 was issued on 15 December 
and is current for interval 19-20 December. Generally enhanced 
HF propagation conditions observed, especially during local night 
hours. Persistent and intense sporadic-E conditions observed 
at times in S Aus/NZ regions. Possible degradations may occur 
at high latitudes late in the UT day or early on 20 Dec due to 
anticipated geomagnetic disturbance from a high speed coronal 
hole wind stream. Disturbances will become more widespread later 
as solar wind parameters intensify. 

IPS Radio and Space Services      | email: asfc at ips.gov.au
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Haymarket NSW 1240  AUSTRALIA     | FTP: ftp://ftp.ips.gov.au 
tel: +61 2 9213 8010              | fax: +61 2 9213 8060 

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