1. School of Environmental Sciences, Jawaharlal Nehru University, New Delhi, India
2. Department of Environmental Science, School of Earth, Environment & Space Studies, Central University of Haryana, Jant-Pali, India
3. Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur, India
4. Radio and Atmospheric Sciences Division (RASD) of CSIR-National Physical Laboratory, New Delhi, India