Submitted on: 22 September 2001.
Revised on: 07 November 2001.
Accepted on: 28 November 2001.
___________________JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS
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Submitted on: 19 December 2005.
Revised on: 08 April 2006.
Accepted on: 27 May 2006.
___________________JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS
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