Hall and finite Larmor radius effects on the dipolarization fronts associated with interchange instability

Abstract

Abstract In this paper, we established a Hall‐finite Larmor radius (FLR) MHD model by including Hall and finite Larmor radius (FLR) effects to study the dipolarization fronts (DFs) produced by the interchange instability in the magnetotail. The results indicate that the Hall effect on the scale of inertial length determines the distributions of electric field at DFs. The FLR effect can not only cause a dawn‐dusk asymmetry of the DF structure but also can make the DF drift dawnward. The dawnward drifting of DF can be attributed to the ion diamagnetic velocity, which also causes alteration in the direction of the high‐speed flow near the DF.