Evidence of the Hall Effect Providing the Core Field inside a Magnetic Flux Rope in an Antiparallel Magnetic Reconnection

Abstract The observations from the Magnetospheric Multiscale mission on 2015 November 12 showed existence of tripolar Hall magnetic fields north X line in a quasi-antiparallel reconnection at dayside magnetopause. bipolar variation normal component field inside middle polar region indicated presence an ion-scale flux rope. coexistence and rope provides first evidence that effect can generate core There is one dip observed We interpret with associated sequential multiple-X-line reconnection. results this study shed light mechanism generation