A Trial of Elimination of Geoelectric Field Variations Induced by Geomagnetic Variations

Abstract

   A model built in the time domain between geomagnetic variations and geoelectric field variations is applied to observation values. The parameters of the model are obtained by minimizing AIC (Akaike Information Criterion). The model with parameters obtained estimates the geoelectric field variations induced by geomagnetic variations and the residuals are calculated by subtracting the estimated values of the induced geoelectric field variations from the observation values.
   The result indicates that this method is available for variations with periods between a few hours and a few days. The spectral density of the residual geoelectric fields has peaks with periods of O₁ and M₂ constituents. On the contrary, that of the observation fields has peaks with periods of S₁, S₂, S₃ etc.