Electron Vorticity at Dipolarization Fronts

Abstract Using magnetospheric multiscale high-resolution measurements, we present the first comprehensive investigation of electron vorticity developing at earthward-propagating dipolarization fronts (DFs). Superposed epoch analysis reveals that increases and behind DFs, with its average magnitude slightly larger than lower hybrid frequency, indicating is related to Hall dynamics DFs. Vorticity DFs exhibits clear anisotropy, ω ⊥ > ∥ , where are components perpendicular parallel local magnetic field, respectively. Parametric dependence shows well anticorrelated density. We find in a statistical sense, vorticity-induced field perturbations not significant, although few cases can generate intense perturbations. This study improve our current understanding DF dynamics.