Institution: | 1. University of Calcutta, 87/1, College Street, Kolkata, 700 073, India 2. School of Space Research, Kyung Hee University, Yongin, 446-701, South Korea 3. Department of Physics and Astronomy, California State University Northridge, Mail Stop: 8268, 18111 Nordhoff Street, Northridge, CA, 91330, USA 4. National solar Observatory, 950 N Cherry Avenue, Tuscan, AZ, 85719, USA
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