Fig. 3
Example MT responses CTAM survey area. Shown are off-diagonal apparent resistivities ρ xy and ρ yx (a, b) and impedance phases φ xy and φ yx (c, d) as a function of period T at polar plateau (PPl) site B22 (Fig. 1) corresponding to high- (left) and low- (right) activity times of the diurnal geomagnetic variation signal during the seven day recording interval of January 11 through January 18, 2012. The error floors assigned in the non-linear 3D inversion are reflected in the error bars, and are similar to the data symbol heights. The computed ρa and φ responses from the inversion model of Fig. 6 are plotted as solid lines
