[Ips-dhfpr] IPS Daily HF Prop Report - 22 March 09

rwc rwc at ips.gov.au
Mon Mar 23 10:44:04 EST 2009


SUBJ: IPS DAILY HF PROPAGATION REPORT
ISSUED AT 22/2330Z MARCH 2009 BY IPS RADIO AND SPACE SERVICES
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (22 MARCH) 
Date   T index  Conditions    
22 Mar     8    Normal         

Flares: none.

MUFs:
   Equatorial PNG/Niue Region:
      Near predicted monthly values.
   Northern Australian Region:
      Depressed by 20% during local day,
      Near predicted monthly values during local night.
   Southern Australian and New Zealand Region:
      Depressed by 15% during local day,
      Enhanced by 15% 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 March:   3
2. FORECAST (23 MARCH - 25 MARCH)
Date   T index  Conditions       MUFs                              
23 Mar     0    Normal           near predicted monthly values 
24 Mar    -5    Normal           0 to 5% below predicted monthly 
                                 values     
25 Mar    -5    Normal           0 to 5% below predicted monthly 
                                 values    
COMMENT: HF maximum frequencies were enhanced on average across 
the region over the entire UT day, but there were significant 
variations. This was due to the geomagnetic enhancements from 
the high-speed solar-wind stream from the coronal hole. Most 
stations from Equatorial (Niue) to Southern (Hobart) showed a 
significant depletion in F region frequencies in the local afternoon 
followed by a significant enhancement after dusk. This was most 
pronounced in Northern Australia (Darwin, Townsville, Learmonth). 
There was widespread and significant spread-F due to the geomagnetic 
disturbance. Across the region MUFs were enhanced slightly above 
predicted monthly averages. Conditions are expected to return 
to near monthly or slightly below over the UT day. Equatorial 
latitudes may remain enhanced and disturbed for an extra day. 
----------------------------------------------------------
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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