National Geophysical Research Institute (CSIR), Uppal Road, Hyderabad, AP 500 606, India
Department of Physics, University of Colorado, Boulder, Boulder, CO 80309, United States ; National Geophysical Research Institute (CSIR), Uppal Road, Hyderabad, AP 500 606, India
National Geophysical Research Institute (CSIR), Uppal Road, Hyderabad, AP 500 606, India
Department of Physics, University of Colorado, Boulder, Boulder, CO 80309, United States