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Earth, Planets and Space
Fig. 3 | Earth, Planets and Space

Fig. 3

From: Spatial gradients of geomagnetic temporal variations causing the instability of inter-station transfer functions

Fig. 3

Amplitudes of spectrograms of geomagnetic data with x (upper) and y (lower) direction, acquired at KAK (left), at KNY (middle), and at MMB (right). The vertical axis denotes the frequencies between 9/30,720 Hz and 108/30,720 Hz, and the standard is 9/30,720 Hz (i.e., the value 0 in the vertical axis corresponds to 9/30,720 Hz). The horizontal axis denotes time window number, with a total of 165

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