Nonlinear aspects of two-dimensional electron magnetohydrodynamics

The propagation and interaction characteristics of nonlinear coherent structures for the electron magnetohydrodynamic (EMHD) model are studied numerically. A point vortex model (PVM) for EMHD is developed which provides a good qualitative understanding of the underlying processes observed numerically. A methodology to extend the PVM for quantitative understanding of the interaction amongst extended structures is also outlined. (author)