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Earth, Planets and Space
Fig. 4. | Earth, Planets and Space

Fig. 4.

From: Hodograph method to estimate the latitudinal profile of the field-line resonance frequency using the data from two ground magnetometers

Fig. 4.

Shows the amplitude ratio and the cross phase calculated from the B38-B37 station pair’s data of Pc 4 magnetic pulsations observed at 0750–0830 UT on Day 177 (June 26), 1998. The two vertical dashed lines surround the frequency range where both the amplitude ratio and the cross phase smoothly change. See text for more details.

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