Measurement of atmospheric air-earth current density from a tropical station using improvised Wilson’s plate antenna

Abstract

We have developed an experimental set-up to measure the atmospheric air-earth current (conduction current). Data obtained with the continuous measurements of Wilson’s plate are used to study of air-earth current density, with the aim of gaining an understanding of the experimental set-up’s response to different meteorological conditions, including fair-weather days. This paper is a part of the on-going Global Electric Circuit (GEC) studies from Tirunelveli (8.7°N, 77.8°E), a measurement site in the tropical and southern tip of the Indian peninsula. Attempts have been made in past few years to obtain the global signature in this region with this sensor, but on most of the occasions it has been impossible to obtain the global signature during fair-weather days. The data used for February–April, 2007 have the well-defined nature of this global signature, which is in agreement with the well-established classical Carnegie curve of GEC. This paper also deals with very important observations made at sunrise and during those hours when fog existed. It is noted that the resistivity of the atmosphere increased significantly with the onset of fog and later decreased as the fog disappeared, based on the measured value of conduction current density when compared with the electric field measured by horizontal passive wire antenna. Also, during fair-weather conditions, conduction current and electric field variations are similar because the conductivity during this period is more or less constant at this site. Observations made during different meteorological conditions, such as different wind speeds, humidities, and temperatures, are also discussed.

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“…Thus regional meteorology and atmospheric electrical weather is controlled by aerosols. Table SM 2 shows the ionospheric potential measurements 27 and the derived air-earth current densities ( I t ).The derived I t s are consistent with the I t measurements during March 2006 and during February, March, April, 2007 made at Tripura 44 (23.5° N, 91.25°E) and at Tirunelveli 45 (8.7° N, 77.8° E) respectively. As Tirunelveli is in the south west of the region selected here, the incoming air over the BB around monsoon season may cross this region and so can represent the I t values calculated in the present analysis.…”

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“…The sum of all these current components is described as the Maxwell current. The current components have been successfully measured in recent years to study atmospheric electrical parameters at the Tirunelveli site [e.g., Panneerselvam et al ., , ; Anil Kumar et al ., ].…”