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Earth, Planets and Space
Fig. 7 | Earth, Planets and Space

Fig. 7

From: Giant ionospheric density hole near the 2022 Hunga-Tonga volcanic eruption: multi-point satellite observations

Fig. 7

a Orbits of GRACE-FO on 13 (cyan), 14 (magenta), and 15 (red) January 2022. The red star indicates Tonga’s location. b GRACE-FO measurements of the electron density along the orbits shown in a. c The neutral density depletion detected by accelerometer onboard GRACE-FO during Tonga volcano (red) as compared with the storm (green) and normal day (blue)

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