[Ips-dhfpr] IPS Daily HF Prop Report - 24 June 08

[rwc]

SUBJ: IPS DAILY HF PROPAGATION REPORT
ISSUED AT 24/2330Z JUNE 2008 BY IPS RADIO AND SPACE SERVICES
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (24 JUNE) 
Date   T index  Conditions    
24 Jun    -3    Normal         

Flares: none.

MUFs:
   Equatorial PNG/Niue Region:
      Near predicted monthly values.
   Northern Australian Region:
      Depressed by 15% during local day,
      Near predicted monthly values during local night.
   Southern Australian and New Zealand Region:
      Near predicted monthly values.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Enhanced by 45% over the UT day.

PCA Event : No event.

Predicted Monthly T index for June:   5
2. FORECAST (25 JUNE - 27 JUNE)
Date   T index  Conditions       MUFs                              
25 Jun     0    Normal           about 10% below predicted monthly 
                                 values 
26 Jun     4    Normal           near predicted monthly values     
27 Jun     4    Normal           Near predicted monthly values    
COMMENT: Australasian region ionosphere was mostly normal over 
the UT day. Spread-F was again prevalent in the north at near 
and sub-equatorial latitudes and at night at many mid-latitude 
stations. There were short, sharp near-dusk MUF enhancements 
at near-equatorial latitudes and some mid-latitude stations. 
There was a sub-equatorial band of lower MUFs (across Learmonth, 
Townsville, Niue) although regions either side (Darwin, PNG and 
mid-latitudes) were normal. * MUFs at mid-latitudes were mostly 
near predicted monthly values with some stations slightly below 
or above. Expect mostly normal HF conditions with MUFs slightly 
below monthly values today. A recurrent solar coronal hole (see 
geomagnetic section) will start to take effect and possibly enhance 
conditions to median levels Thu/Fri. * MUFs in the Antarctic 
were above predicted monthly values. A strong IMF BZ southward 
turning at 22UT, causing merging with the geomagnetic field, 
coupled with onset of rising solar wind speed may cause geomagnetic 
disturbances in Antarctica and disturbed ionosphere as twin-cell 
convection commences. 
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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.

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