Abstract
The first in situ observation of collisionless Hall reconnection in the high‐latitude region when the interplanetary magnetic field (IMF) By dominates is reported in this paper. On 23 March 2002, Cluster crossed the magnetopause current sheet when it traveled outbound in the Northern Hemisphere. The interface between the cusp and the magnetosheath is clearly associated with sharp transitions of the magnetic field and plasma moments. These variations suggest that the interface is a clear current sheet with a thickness of 218 km. Energetic electrons, protons, helium, and oxygen ions were observed and their intensity peaked at this current sheet. During that time period, the IMF Bz is around zero and the IMF By component dominates. The geometry of the magnetic field preferred By reconnection. The bipolar signature in the magnetic field observed by Cluster is consistent with Hall effects in the reconnection process. Characteristics of three By reconnection events are presented in this paper.
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