[Ips-dhfpr] IPS Daily HF Prop Report - 04 September 07

[rwc]

SUBJ: IPS DAILY HF PROPAGATION REPORT
ISSUED AT 04/2330Z SEPTEMBER 2007 BY IPS RADIO AND SPACE SERVICES
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (04 SEPTEMBER) 
Date   T index  Conditions    
04 Sep    -2    Normal         

Flares: none.

MUFs:
   Equatorial PNG/Niue Region:
      Mostly near predicted monthly values although some
      dusk and night depressions observed,
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian and New Zealand Region:
      Near predicted monthly values.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Near predicted monthly values over the UT day.

PCA Event : No event.

Predicted Monthly T index for September:  10
2. FORECAST (05 SEPTEMBER - 07 SEPTEMBER)
Date   T index  Conditions       MUFs                              
05 Sep    10    Normal           about 5% below predicted monthly 
                                 values 
06 Sep     0    Normal           10 to 20% below predicted monthly 
                                 values     
07 Sep     8    Normal           about 5% below predicted monthly 
                                 values    
COMMENT: Generally expect frequencies to be returning to near 
or slightly below monthly averages today as solar coronal hole 
effects decline. Next recurrent hole expected to take effect 
on 6th Sept. Solar wind speed remains moderately elevated however 
so the geomagnetic field may remain slightly active before the 
next cornal hole HSSWS. This will continue to depress the ionosphere 
and there is also low ionistation from AR970 to replenish it. 
Strong spread F was observed pre-dawn and night at many latitudes. 
Sporadic E was also widespread although often non-blanketing. 
This may degrade communications with multipath fading if it re-occurs.equatorial 
latitudes showed slight depressions. Polar latitudes showed some 
absorption although this was not a full PCA. 
----------------------------------------------------------
For an explanation of some of the terms in this report, goto
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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