Bulg. J. Phys. vol.45 no.3 (2018), pp. 285-298

Influence of Atmospheric Aerosol on Near Surface Fair-Weather Vertical Electric Field: A Study from Northeast India

P. Dhar, A. Guha, B.K. De
Department of Physics, Tripura University, Suryamaninagar-799 022, India
Abstract. The present work investigates the characteristic variation of atmospheric vertical electric field (VEF) from a land based observatory located in Tripura, in the North-East India. The analysis is performed using the VEF data on 32 fair-weather days, selected over a period of three years, from September 2010 to September 2013. The contribution from atmospheric aerosol in the planetary boundary layer (PBL) resulting an enhancement in VEF is observed and explained on the basis of electrical conductivity modulation. To retrieve the universal global signature in diurnal VEF variation, namely, the Carnegie curve, it is necessary to eliminate the effects of aerosol concentration on VEF. So, based on the methodology adopted by previous workers, an effort has been put forward to separate out the effects of aerosol concentration on VEF. It is observed that a poor correlation between the corrected VEF data and universal Carnegie curve data put a limitation on efficiency of the correction mechanism as proposed by other workers. The possible reason of this poor correlation is discussed on the basis of complexity of atmospheric conductivity modulation in the Planetary Boundary Layer (PBL) by change in aerosol concentration over different times of the diurnal cycle.

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