Vikas Rawat, ARIES, Nainital, India; Narendra Singh, ARIES, India; Surendra Kumar Dhaka, Rajdhani college, University of Delhi, India; Prabir K. Patra, Japan Agency for Marine-Earth Science and Technology, Japan; Yutaka Matsumi, Institute for Space-Earth Environmental Research, Nagoya University, Japan; Tomoki Nakayama, Faculty of Environmental Science, Nagasaki University, Japan; Sachiko Hayashida, Faculty of Science, Nara Women's University, Japan