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Influence of the dawn‐dusk potential drop across the polar cap on the high‐latitude atmospheric vertical current
Author(s) -
D'Angelo N.,
Iversen I. B.,
Madsen M. Møhl
Publication year - 1982
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl009i007p00773
Subject(s) - dusk , ionosphere , polar cap , atmospheric sciences , latitude , polar , quiet , atmospheric electricity , current (fluid) , environmental science , geology , electric field , geodesy , meteorology , geophysics , physics , astronomy , oceanography , quantum mechanics
Approximately 1200 hours of high‐latitude balloon measurements of atmospheric vertical electric fields and conductivity have been used to derive the UT variation of the ionosphere‐to‐ground vertical current. During geomagnetically quiet days the well known UT modulation, with a minimum at 4‐6 UT and a maximum near 19 UT, is observed. During disturbed days, the dawn‐dusk potential drop across the polar cap clearly influences the vertical current, as was predicted by Park and Dejnakarintra (1977)