1. Department of Physics, Institute of Science, Banaras Hindu University , Varanasi 221005, India
2. Department of Astrophysics and Cosmology, S. N. Bose National Centre for Basic Sciences , Block-JD, Sector-III, Salt Lake, Kolkata 700106, India
3. Department of Space, Earth and Environment, Chalmers University of Technology , SE-412 96 Gothenburg, Sweden
4. Physical Research Laboratory , Navrangpura, Ahmedabad 380009, India
5. Institute of Astronomy Space and Earth Science , AJ 316, Salt Lake, Sector II, Kolkata 700091, India