First results of fair-weather atmospheric electricity measurements in Northeast India |
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| Authors: | A Guha B K De S Gurubaran S S De K Jeeva |
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| Institution: | 1.Department of Physics,Tripura University,Suryamaninagar,India;2.Equatorial Geophysical Research Laboratory,Indian Institute of Geomagnetism,Krishnapuram, Tirunelveli,India;3.Centre of Advanced Study in Radiophysics and Electronics 1, Girish Vidyaratna Lane,University of Calcutta,Kolkata,India |
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| Abstract: | During the month of March 2006, a short campaign was conducted to measure fair-weather atmospheric electricity parameters
in Tripura, Northeast India (23.50°N, 91.25°E). The campaign was the first of its kind in this region of the globe. The main
objective of the campaign was to characterize the diurnal variation of three parameters namely vertical potential gradient
(E), vertical air-earth current density (J
z
) and atmospheric electrical conductivity (σ) in fair-weather conditions. The diurnal variation of E and J
z
over sixteen fair-weather days shows two distinct maxima around 14UT and 20UT and a minimum around 03UT. The average vertical
potential gradient is found to be 108V·m−1 and air-earth current density 1.85 pA·m−2. The average bipolar atmospheric electrical conductivity at the ground level is found to be 19.6 fS·m−1. An excellent positive correlation between E and J
z
is found, with a correlation coefficient of 0.96. A comparative study with Carnegie universal variation shows 70% correlation
with observed variation of vertical potential gradient during the period of the campaign. The results are discussed in view
of difficulty as well as possibility of getting global signatures in atmospheric electricity measurements made from tropical
land stations. |
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