Generation of Coherent Structures in Electron Magnetohydrodynamics

Nonlinear coherent vortices of two-dimensional incompressible electron magnetohydrodynamics (EMHD) are investigated in a îow in which curl of generalized electron momenta is frozen into electron component of îow against immobile ions background. The vortices are found to be generated through nonlinear self interaction of relatively fast electron whistler modes, when they are subject to modulational instability. The unstable EMHD modes are identiìed in the spectrum that lead to localized coherent structures