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

Fig. 4.

From: Giant ionospheric disturbances observed with the SuperDARN Hokkaido HF radar and GPS network after the 2011 Tohoku earthquake

Fig. 4.

(a) Time and ground range variations of Doppler velocity (with echo power higher than 20 dB) on beam 4. Echoes within a dotted gray rectangle are partly contaminated by 2-hop echoes. (b) Moshiri induction magnetometer record of dH/dt at a sampling rate of 64 Hz. (c) Moshiri induction magnetometer record of dH/dt averaged over 4 s. (d) Frequency spectra of dH/dt, dD/dt and dZ/dt. Sensitivity of the magnetometer is also plotted.

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