Open AccessElectric Currents In the Ocean Induced By A Model Dst Field and Their Effects On the Estimation of Mantle Conductivity
Author(s) -
Takeda Masahiko
Publication year - 1993
Publication title -
geophysical journal international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0956-540X
DOI - 10.1111/j.1365-246x.1993.tb03917.x
Subject(s) - earth's magnetic field , geophysics , geology , electric field , mantle (geology) , electrical resistivity and conductivity , ocean current , magnetic field , conductivity , geodesy , physics , climatology , quantum mechanics
SUMMARY Electric currents induced in the ocean by the external Dst fields are simulated for a system which consists of a uniform geocentric sphere of finite conductivity and a non‐uniformly conductive thin‐shell sphere representing the sea‐land distribution. the effect of the ocean on the Dst field is smaller than that on the geomagnetic Sq field. However, fairly strong currents are induced is the Antarctic Ocean, and these currents partly explain the anomalous behaviour of the geomagnetic response observed at Hermanus especially for the variations of periods of less than two days.