Fig. 5: SAs observed by FY-3D WAI during four geomagnetic storms in 2018.
From: Plasmapause surface wave oscillates the magnetosphere and diffuse aurora

All the images observed between a 22:11–22:32 UTC on 14 March 2018, b 22:31–22:48 UTC on 5 May 2018, c 20:53–21:15 UTC on 18 March 2018, and d 23:54–00:15 UTC on 25 August 2018 are projected onto a reference sphere at a height of 110 km in the AACGM–MLT coordinate system. The SAs are highlighted by the red arrows. Detailed structural parameters of the SAs are listed in Table 1.