[Ips-dhfpr] IPS Daily HF Prop Report - 08 June 10

[rwc]

SUBJ: IPS DAILY HF PROPAGATION REPORT
ISSUED AT 08/2330Z JUNE 2010 BY IPS RADIO AND SPACE SERVICES
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (08 JUNE) 
Date   T index  Conditions    
08 Jun     9    Normal         

Flares: none.

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

PCA Event : No event.

Predicted Monthly T index for June:  26
2. FORECAST (09 JUNE - 11 JUNE)
Date   T index  Conditions       MUFs                              
09 Jun    14    Normal           near predicted monthly values/depressed 
                                 0 to 10% 
10 Jun    14    Normal           near predicted monthly values/depressed 
                                 0 to 10%     
11 Jun    11    Normal           near predicted monthly values/depressed 
                                 0 to 10%    
COMMENT: Frequencies were down across the region generally, due 
to reduced EUV ionisation as the sunspot groups decline or rotate 
off the solar disc. Solar wind speed increase due to a recurrent 
coronal hole slightly increased geomagnetic activity which also 
contributed in depressing frequencies. This hole is thin in solar 
longitude however, so effects should only last for a day or two. 
Spread F is prevalent at several stations, particularly at night, 
and likely to continue for a day. The STEREO-B spacecraft has 
observed a prolonged Bz southwards period, estimated to meet 
Earth on 13-14th June and probably associated with a solar sector 
boundary predicted in models. This will probably result in moderately 
disturbed geomagnetic and hence ionospheric conditions. 
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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.

IPS Radio and Space Services        email: asfc at ips.gov.au
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