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Investigation of the homogeneity of energy conversion processes at dipolarization fronts from MMS measurements

Russell, C. T.; Lavraud, B.; Anderson, B. J. +28 more

We report on six dipolarization fronts (DFs) embedded in fast earthward flows detected by the Magnetospheric Multiscale mission during a substorm event on 23 July 2017. We analyzed Ohm's law for each event and found that ions are mostly decoupled from the magnetic field by Hall fields. However, the electron pressure gradient term is also contribut…

Tripolar guide magnetic fields due to island coalescence in solar wind current sheets: Simulation and theory

Newman, David L.; Eriksson, Stefan; Lapenta, Giovanni

Reconnecting current sheets (CSs) in the solar wind near 1 AU have been previously identified that exhibit a modified Hall magnetic field perturbation of the nominal guide field characterized by a "tripolar" structure with depressions on both sides of a central maximum [Eriksson et al., Astrophys. J. 805, 43 (2015)]. Such CSs were inferred to cont…