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Using fully kinetic simulations, we study the suppression of asymmetricreconnection in the limit where the diamagnetic drift speed >> Alfven speed andthe magnetic shear angle is moderate. We demonstrate that the slippage betweenelectrons and the magnetic flux facilitates reconnection, and can even resultin fast reconnection that lacks one of the outflow jets. Through comparing acase where the diamagnetic drift is supported by the temperature gradient witha companion case that has a density gradient instead, we identify a robustsuppression mechanism. The drift of the x-line is slowed down locally by theasymmetric nature of the current sheet and the resulting tearing modes, thenthe x-line is run over and swallowed by the faster-moving following flux.

Suppression of collisionless magnetic reconnection in asymmetric current sheets