Hall effect in plasma flow near X-point

Summary form only given, as follows. The behaviour of a plasma permeated by a magnetic field, where the field possesses a hyperbolic neutral point, has been of interest for many years. Flows in the neighbourhood of such neutral points play a significant role in the Earth´s magnetosphere and solar flares as well as in laboratory devices (tokamak, compact toroid, FRC). The numerical modelling of magnetohydrodynamic flows with Hall effect is presented. The two-dimensional MHD code includes the effect of helicity and plasma resistivity. The propagation of alfvenic and magnetosonic waves in the vicinity of X-point of magnetic field is studied. Strong poloidal electric current sheet appears under the influence of an alfvenic wave. If the amplitude of magnetosonic wave is compared with the alfvenic one, a toroidal current sheet appears too. Hall effect leads to strong deformation of the sheets. Plasma density has a minimum in the sheet if the alfvenic wave has advantage over the magnetosonic one and maximum in the opposite case. Hall effect dramatically changes velocity distribution. There is a strong flux in the vicinity of the plane of symmetry directed along this plane because of Hall effect.