“…Yet ground ionospheric observations have reported on multiple onsets in the course of the same substorm (Baumjohann et al, ). Further in situ observations and theoretical works have suggested that intermittent BBFs creating small “wedgelets” can be responsible for multiple onsets (e.g., Birn et al, ; Birn & Hesse, ; Liu et al, ; McPherron et al, ; Malykhin et al, ; Nakamura et al, ; Palin et al, ; Sergeev et al, ). Sparse documented proof exists on a relation between the ionospheric and plasma sheet observations, because not all BBFs can lead to global magnetotail dipolarization (Baumjohann et al, ) at GEO (Ohtani et al, ); BBFs and embedded in them DI fronts may experience tailward rebounds due to buoyancy force (Birn et al, ; Chen & Wolf, ; Nakamura et al, ; Panov et al, ; Wolf et al, ).…”