[Ips-dhfpr] IPS Daily HF Prop Report - 07 August 12 issued 2340 UT on 07 Aug 2012

rwc rwc at ips.gov.au
Wed Aug 8 09:40:36 EST 2012


SUBJ: IPS DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/07 AUGUST 2012 BY IPS RADIO AND SPACE SERVICES
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (07 AUGUST) 
Date   T index  Conditions    
07 Aug    89    Normal         

Flares: none.

MUFs:
   Cocos Island Region:
      Enhanced by 40% during local day.
      Depressed by 15% during local night.
   Niue Island Region:
      Near predicted monthly values.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 15% during local night.
   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 August:  77


2. FORECAST (08 AUGUST - 10 AUGUST)
Date   T index  Conditions       MUFs                              
08 Aug    70    Normal           0 to 10% below predicted monthly 
                                 values
09 Aug    80    Normal           Near predicted monthly values    
10 Aug    85    Normal           Near predicted monthly values   

COMMENT: HF conditions were Normal 07-Aug, with MUFs mostly near 
monthly values at mid-latitudes and more variable at low-latitudes 
with night depressions in northern Australia. The most southern 
Australian latitudes experienced strong nightime spread-F conditions, 
measured at Hobart, causing HF multipath fading. The ionosphere 
is stronger than average and T index is higher than the predicted 
monthly value due to a large number of smaller sunspots emitting 
ionising EUV. Early UT day 8 Aug a CME should strike a glancing 
blow causing Unsettled-Active geomagnetic conditions, slightly 
depressing MUFs, with recovery on the 9th.

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