Singular Vortex Formations in a Magnetized Plasma

Formation of singular vortices in a magnetized plasma is presented. One is "plasma hole", which is characterized by fast azimuthal rotation and a density hole in its core region. It is found that the charge neutrality condition does break down in the hole region over 1000 times the Debye length. Another example is an anti-E × B vortex, which rotates in the opposite direction to the E × B drift. This result means that there exists a predominant force acting on ions other than the electric field. The interaction between ions and neutral flow and the resultant momentum transfer play an essential role on generation of anti-E x B rotation.