Figure 8.

The sketch of the magnetotail and PSBL layering during 23 June 2015 storm. The trajectory of DMSP and MMS are indicated, respectively, in pink near the Earth and black at midtail. The bottom rectangle is a zoomed‐in view of what PSBL looked like when MMS crossed the boundary. The convecting oxygen O⁺ (pink) along with the polar rain electrons (purple) are present in the lobe region. At the outer edge of electron boundary layer (EBL), the strong PSBL earthward electron beams (dark blue) are observed, while the polar rain starts to disappear. In the inner edge of EBL the bouncing PSBL electron (light blue) heat up, hence the bigger gyroradius. At the ion boundary layer (IBL), the first beams of earthward ions (red) arrive and magnetic perturbations are being observed (green waves). The bouncing plasmasheet ions (orange) can be present at the IBL, as they have had enough time to convect inward of PSBL and earthward. The time sequence of the observations is shown by a dot‐dashed line and labeled as T1 to T5 from the observation (see Figure 5). Also near the X‐line, T0, which is 30 s sooner than T3, shows the time delay between electron injection time and ion injection time (see section 4 for details).