Fig. 1From: Oxygen torus and its coincidence with EMIC wave in the deep inner magnetosphere: Van Allen Probe B and Arase observationsa Orbits of Van Allen Probe A for 04:00–11:30 UT (red curve), Van Allen Probe B for 02:00–09:30 UT (blue curve), and Arase for 03:00–11:00 UT (green curve) on 12 September 2017 in the L-MLT plane. b The real-time Dst index for 7–14 September 2017. A horizontal bar represents the time interval of 02:00–11:30 UT on 12 September 2017 which covers the orbital segments of Probe A, Probe B, and Arase shown in aBack to article page