Bulg. J. Phys. vol.37 no.1 (2010), pp. 37-47

Studies on the Variations of ELF Atmospherics over Kolkata

S.S. De1, B.K. De2, B. Bandyopadhyay1, G. Guha1, S. Paul1, A. Bhowmick2, D.K. Haldar1, G. Chattopadhyay2, M. Sanfui1
1S.K. Mitra Centre for Research in Space Environment, Centre of Advanced Study in Radio Physics and Electronics, University of Calcutta, Kolkata 700 009, India
2Department of Physics, University of Tripura, Agartala 799 130, India
Abstract. The atmospheric radio noise field strength (ARNFS) at 700 Hz and 2100 Hz over Kolkata (Lat. 22.560 N, Long. 88.50 E) exhibits various characteristic patterns of diurnal and seasonal variations. Some distinctive features at these two frequencies have been observed in respect of the level of ARNFS during all the months, the fall of level from nighttime to daytime value, the correlation in sunrise time and the role of cloud activity upon the seasonal maximum. The outcome of analysis of the recorded data will be presented in this paper.

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