Open AccessVariations of the atmospheric electric field in the near‐pole region related to the interplanetary magnetic field
Author(s) -
FrankKamenetsky A. V.,
Troshichev O. A.,
Burns G. B.,
Papitashvili V. O.
Publication year - 2001
Publication title -
journal of geophysical research: space physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/2000ja900058
Subject(s) - diurnal temperature variation , atmospheric sciences , daytime , electric field , interplanetary magnetic field , thunderstorm , earth's magnetic field , interplanetary spaceflight , physics , snow , environmental science , climatology , solar wind , magnetic field , geology , meteorology , quantum mechanics
Variations in the atmospheric, near‐surface vertical electric field component E z measured at the Russian Antarctic station Vostok in 1998 are analyzed in conjunction with changes of the interplanetary magnetic field (IMF). A total of 134 days were selected which satisfied the “fair weather” conditions, that is, days with absence of high winds, falling or drifting snow, clouds, and electric field “pollution” from the station's power plant. It is shown that the average diurnal variation of E z for these days follows the global geoelectric field “fair ‐ weather” diurnal variation: the “Carnegie” curve, which describes the global electric circuit formed by the thunderstorm activity occurring mostly over equatorial regions. The E z diurnal variation shows strong seasonal dependence: it is maximal (∼40% of the average daily magnitude) in summer but gradually reduces through the equinoctial months and is almost negligible during the austral winter. E z at Vostok is strongly affected by variations in both the IMF B y and B z components. The influence of B y is dominant during geomagnetic daytime hours (1100–1400 UT at Vostok): E z increases with B y in the range from −10 to +10 nT. The IMF B z effect is mainly seen at dawn (E z decreases with B z ) and dusk (E z increases with B z ).