1. a K. Banerjee Centre of Atmospheric and Ocean Studies , University of Allahabad , Allahabad , India
2. b M. N. Centre of Space Studies , University of Allahabad , Allahabad , India
3. c Department of Atmospheric and Ocean Sciences , University of Allahabad , Allahabad , India
4. d Directorate of Census Operations Chandigarh , Chandigarh , India