München 1997 – wissenschaftliches Programm

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EP: Extraterrestrische Physik

EP 2: Magnetosph
äre 1

EP 2.10: Vortrag

Montag, 17. März 1997, 10:45–11:00, 302

2D-model of tail-like current layer destruction caused by a finite diffusion region — •A.V. Runov 1), M.I. Pudovkin 1), and C.-V. Meister 2) — 1) Institute of Physics, University St. Petersburg, 2) University Potsdam, WIP-Project Space Plasma Physics

Results of the numerical modelling of the evolution of a current sheet caused by anomalous resistivity changing with the time are presented. The initial magnetic field configuration is chosen to be a tail-like equilibrium layer with nonzero normal component. The evolution process is initiated introducing local resistivity in a segment along the symmetry axis of the layer. Further the time development of the resistivity is determined by the variation of the MHD configuration. In the case of nonzero normal magnetic field component, in the layer the anomalous resistivity may by produced by ionacoustic (in solar flares) or lower-hybrid drift type (in solar flares, magnetotails) waves. Thus, the dependence of the resistivity on the magnetic pressure gradient is taken into account (as done in [1]). The temporal and spatial evolution of the magnetic and electric fields, the anomalous resistivity, plasma velocity, density, pressure, and MHD wave-like disturbances are considered for a time interval of two hundred growth times of the initial resistivity pulse. Our calculations show an x-line magnetic field configuration, and plasma acceleration along the layer.

[1] M. Hoshino, J. Geophys. Res. 96(A7), 11555 (1991)