Yuri Litvinenko, University of New Hampshire, USA Current sheet formation at a magnetic neutral line in Hall magnetohydrodynamics June 23, 2008, 3:15pm Campus Golm, Building 28, Room 0.108 The dynamics of a plasma in the vicinity of a neutral line of the magnetic field is considered in the framework of incompressible Hall magnetohydrodynamics (MHD). A self-similar solution for the collapse to a current sheet is obtained. Numerical and analytical results are presented. In contrast to the standard incompressible MHD model in two dimensions, the Hall effect leads to the formation of finite-time singularites of the velocity derivatives and the electric current density at the neutral line. Implications of the results for Hall MHD models of fast magnetic reconnection are discussed.