BREAKUP OF THE ELECTRON CURRENT LAYER DURING 3-D COLLISIONLESS MAGNETIC RECONNECTION

The structure of the electron current layer which forms in the dissipa tion region during magnetic reconnection in a collisionless plasma is explored by advancing the 3 - D electron magnetohydrodynamic (EMHD) eq uations. The current layer thins down below the electron skin depth c/ omega(pe) and then breaks up into a fully turbulent distribution of sw irling vortices. The turbulence is sufficiently strong that current is largely shunted into the plane of the magnetic reconnection. The resu lts are consistent with the absense of electron scale current layers i n satellite observations of the magnetosphere.