Anomalous diurnal variation of atmospheric potential gradient and air-Earth current density observed at Maitri, Antarctica

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dc.contributor.author Jeeva, K.
dc.contributor.author Gurubaran, S.
dc.contributor.author Williams, E.R.
dc.contributor.author Kamara, A.K.
dc.contributor.author Sinha, Ashwini K.
dc.contributor.author Guha, A.
dc.contributor.author Selvaraj, C.
dc.contributor.author Nair, K.U.
dc.contributor.author Dhar, Ajay
dc.date.accessioned 2017-11-08T05:55:32Z
dc.date.accessioned 2021-02-12T08:52:56Z
dc.date.available 2017-11-08T05:55:32Z
dc.date.available 2021-02-12T08:52:56Z
dc.date.issued 2016
dc.identifier.citation JGR, 121, 12,593–12,611, doi:10.1002/2016JD025043 en_US
dc.identifier.uri http://localhost:8080/xmlui/handle/123456789/1090
dc.description.abstract The scope of this paper is to explore the mechanisms operating over Maitri (70.76°S, 11.74°E, 117m above mean sea level), a coastal Antarctic station, that produce an anomalous fair-weather diurnal pattern of the atmospheric electric potential gradient (PG) and air-Earth current density (AEC). The anomaly in the diurnal variations of AEC and the PG is displaying an ostensible minimum at ~10 UT and a diminished response to the thunderstorm over the African continent in the 14–16 UT time frame. The data sets (2005–2014, except 2012) of the PG, and to some extent, AEC, from Maitri, are used to explore this anomaly. It follows that the fair-weather electrical phenomena over Maitri can be ascribed to global electrified convection on the one hand and to regional phenomena like convection due to the replacement of warm air by katabatic winds on the other hand. The katabatic winds originate on the polar plateau and blow from ~130° at Maitri which are likely to transport various elements from the mountain slopes, and space charge from the polar plateau is expected to produce various disturbances in the PG and AEC monitored over the coastal Antarctica. This mechanism may be responsible for peaks in the early UT hours and also for the anomalous behavior of atmospheric electrical parameters observed at Maitri. Maitri data are compared with that of Carnegie cruise and Vostok to explain the source of anomaly. en_US
dc.language.iso en en_US
dc.subject Atmospheric potential gradient en_US
dc.subject Air-Earth current density en_US
dc.subject Maitri en_US
dc.subject Antarctica en_US
dc.title Anomalous diurnal variation of atmospheric potential gradient and air-Earth current density observed at Maitri, Antarctica en_US
dc.type Article en_US
dc.identifier.accession 091633


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