Effective Resistivity Models Evaluated in Kinetic Studies in the Framework of MHD Approach

Abstract:

We propose effective resistivity models evaluated in study of the anomalous resistivity induced in the instability occurring during the wave particle interaction in microscopic approach and of steady collisionless driven reconnection resistivity model. It is well known that magnetic reconnection plays important role in space plasma phenomena such as a solar flare or substorm of earth magnetoshere. The magnetohydrodynamic (MHD) approach have been used for studies of those phenomena, in which some traditional models for a resistivity with the assumption of dependence of current or magnetic field, or with no physical reason are adopted for MHD simulations of magnetic reconnection. We perform 2D numerical simulations of magnetic reconnection in the MHD framework with our two proposed effective resistivity models and in the kinetic approach (full PIC simulation), and compare the results obtained in those ways. We also discuss about application of the effective resistivity models to investigation of substorm of earth magnetosphere by global MHD simulation.