[Ips-dhfpr] IPS Daily HF Prop Report - 01 December 09

[rwc]

SUBJ: IPS DAILY HF PROPAGATION REPORT
ISSUED AT 01/2330Z DECEMBER 2009 BY IPS RADIO AND SPACE SERVICES
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (01 DECEMBER) 
Date   T index  Conditions    
01 Dec   -12    Normal         

Flares: none.

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

PCA Event : No event.

Predicted Monthly T index for December:   1
2. FORECAST (02 DECEMBER - 04 DECEMBER)
Date   T index  Conditions       MUFs                              
02 Dec    -5    Normal           near predicted monthly values 
03 Dec    -5    Normal           Near predicted monthly values     
04 Dec   -10    Normal           about 0 10% below predicted 
                                 monthly values    
COMMENT: Daytime depletions were observed across Aus/NZ mid-latitude 
regions over the last 24 hours with a greater effect towards 
the north. Near equatorial stations observed large variations 
despite quiet geomagnetic conditions, with very large pre-noon 
and post dusk depletions. Similar conditions may be expected 
for the next 3 days with a slight overall increase in frequencies 
to near predicted monthly median levels in 12-36 hours if geomagnetic 
activity is enhanced by a coronal hole induced high speed solar 
wind stream. Extensive blanketing Esb was observed at many stations, 
particuliarly at northern Aus and near equatorial. Cocos Is has 
Esb at night, Nuie Es in the afternoon, Darwin Esb mid-afternoon, 
Townsville Es near 02LT, Brisbane Es near midday and midnight, 
Sydney Es and spread F near 04LT, Norfolk Is had Esb 14-18LT. 
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For an explanation of some of the terms in this report, go to
http://www.ips.gov.au, and follow links to Educational->
Glossary on Solar Terrestrial Terms.

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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