Electric Currents In the Ocean Induced By A Model Dst Field and Their Effects On the Estimation of Mantle Conductivity

• Published in: Geophysical Journal International
• Main Author: Takeda, Masahiko
• Format: Text
• Language: English
• Published: Oxford University Press 1993
• Subjects: Articles; Antarctic; Antarctic Ocean; The Antarctic; Antarc*
• Online Access: http://gji.oxfordjournals.org/cgi/content/short/114/2/289; https://doi.org/10.1111/j.1365-246X.1993.tb03917.x

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.