Fig. 5

Event 2 Pulsations recorded in the geomagnetic field and GIC on day 2015 132. a waveforms of \(B_Y\) pulsations at KEV (magenta) and GIC at VKH (dark blue); b normalized PSD spectra; c \(B-I\) spectral coherence for \(B_Y\) (solid) and \(B_X\) (dashed); d I to \(B_Y\) PSD ratio