[Ips-dhfpr] IPS Daily HF Prop Report - 10 December 09

rwc rwc at ips.gov.au
Fri Dec 11 10:04:29 EST 2009


SUBJ: IPS DAILY HF PROPAGATION REPORT
ISSUED AT 10/2330Z DECEMBER 2009 BY IPS RADIO AND SPACE SERVICES
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (10 DECEMBER) 
Date   T index  Conditions    
10 Dec   -37    Normal-poor    

Flares: none.

MUFs:
   Cocos Island Region:
      Near predicted monthly values.
   Niue Island Region:
      Depressed by 40% during local day,
      Depressed by 35% during local night.
   Northern Australian Region:
      Depressed by 30% during local day,
      Depressed by 35% during local night.
   Southern Australian and New Zealand Region:
      Depressed by 20% during local day,
      Depressed by 20% 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 (11 DECEMBER - 13 DECEMBER)
Date   T index  Conditions       MUFs                              
11 Dec   -25    Normal-fair      15 to 30% below predicted monthly 
                                 values 
12 Dec   -25    Normal           10 to 20% below predicted monthly 
                                 values     
13 Dec   -20    Normal           near predicted monthly values/depressed 
                                 10 to 20%    

COMMENT: IPS HF Communications Warning 9 was issued on 9 December 
and is current for interval 10-12 December. MUFs were again consistently 
depressed across the Australian region over the day, particularly 
at mid-low latitudes (N.Aus). HF conditions were poor at times 
with sporadic E observed at multiple stations, most notably during 
the day at mid latitudes. Ionospheric support is expected to 
continue to be depressed for the next three days due to continuing 
weak solar activity, although there should be some gradual improvement 
as solar active regions currently near the east limb rotate further 
onto the visible disk. HF conditions are likely to be variable 
with the possibility of further sporadic E degrading HF. 

----------------------------------------------------------
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
PO Box 1386                         WWW: http://www.ips.gov.au
Haymarket NSW 1240  AUSTRALIA       FTP: ftp://ftp.ips.gov.au 
tel: +61 2 9213 8010                fax: +61 2 9213 8060 

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