Fig. 6
From: Influence of geomagnetic storms on the quality of magnetotelluric impedance
MT sounding curves and coherence distributions during the storm and non-storm days using the data observed at site 163. The black color indicates the results calculated by the non-storm data observed from 00:00 on November 1 to 00:00 on November 4; the red color indicates the results calculated by storm data observed from 06:00 on October 29 to 06:00 on October 31. a–d Show the apparent resistivity. e–h Show the impedance phase. i–l Show the distribution of coherence. The horizontal axis denotes the period in seconds