[Ips-dhfpr] IPS Daily HF Prop Report - 11 December 09

[rwc]

SUBJ: IPS DAILY HF PROPAGATION REPORT
ISSUED AT 11/2330Z DECEMBER 2009 BY IPS RADIO AND SPACE SERVICES
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (11 DECEMBER) 
Date   T index  Conditions    
11 Dec   -38    Normal-fair    

Flares: none.

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

PCA Event : No event.

Predicted Monthly T index for December:   1
2. FORECAST (12 DECEMBER - 14 DECEMBER)
Date   T index  Conditions       MUFs                              
12 Dec   -35    Normal-fair      15 to 30% below predicted monthly 
                                 values 
13 Dec   -30    Normal           15 to 30% below predicted monthly 
                                 values     
14 Dec   -30    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 remain consistently 
depressed across the Australian region in a typical summertime 
response to low solar activity. Mid-low latitude (N.Aus) sites 
were particularly affected with MUF depressions up to 35% overnight. 
HF conditions were again poor at times with considerable sporadic 
E, most notably during early afternoon hours at mid latitudes. 
These conditions are expected to continue for the next three 
days at least due to continuing weak solar activity. There may 
be some gradual improvement as solar active regions currently 
near the east limb rotate further onto the visible disk, however 
these active regions are weak and likely to provide only slight 
improvement to ionospheric conditions. 

----------------------------------------------------------
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 

IMPORTANT: This e-mail, including any attachments, may contain,
confidential or copyright information.  The views expressed in 
this message are those of the individual sender, unless 
specifically stated to be the views of IPS.  If you are not 
the intended recipient, please contact the sender immediately 
and delete all copies of this e-mail and attachments. 
Occasionally IPS sends email promoting IPS products and 
services to its mailing list customers. If you do not wish to 
receive this promotional material please email 
no-spam at ips.gov.au with the subject header:UNSUBSCRIBE"