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

Fig. 3

From: Ionospheric disturbances observed over Japan following the eruption of Hunga Tonga-Hunga Ha’apai on 15 January 2022

Fig. 3

a Perturbation component of TEC (dTEC) at 0830 UT (1730 JST) on 15 January 2022. b Keograms of dTEC along the white dashed lines in a, northward and westward directions, and the direction of the velocity from (37\(^\circ\) N, 142\(^\circ\) E). c dTEC at 1130 UT (2030 JST) on 15 January 2022. d Keograms of dTEC along the white dashed lines in c, northward and westward directions, and the direction of the velocity from (33\(^\circ\) N, 137\(^\circ\) E)

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