Abstract
AbstractWith high‐resolution data of the recently launched Magnetospheric Multiscale mission, we report a magnetic reconnection event at the dayside magnetopause. This reconnection event, having a density asymmetry Nhigh/Nlow ≈ 2 on the two sides of the reconnecting current sheet and a guide field Bg ≈ 0.4B0 in the “out‐of‐plane” direction, exhibit all the two‐fluid features: Alfvenic plasma jets in the outflow region, bipolar Hall electric fields toward the current sheet center, quadrupolar Hall magnetic fields in the “out‐of‐plane” direction, and the corresponding Hall currents. Obviously, the density asymmetry Nhigh/Nlow ≈ 2 and the guide field Bg ≈ 0.4B0 are not sufficient to dismiss the quadrupolar pattern of Hall reconnection. This is different from previous simulations, where the bipolar pattern of Hall reconnection was suggested.
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