Fig. 7From: Simulation study of atmosphere–ionosphere variations driven by the eruption of Hunga Tonga-Hunga Ha’apai on 15 January 2022Global plots of the perturbation horizontal radial velocities at an altitude of 300 km. a 5:00 UT, b 8:00 UT, c 11:00 UT, and d 14:00 UT. Positive sign (red) indicates outward, and negative sign (blue) indicates inwardBack to article page