Time-dependent and Quasi-steady State Reconnection and Their Consequences at the Dayside Magnetopause

Details Time-dependent and Quasi-steady State Reconnection and Their Consequences at the Dayside Magnetopause Time-dependent and Quasi-steady State Reconnection and Their Consequences at the Dayside Magnetopause

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm41b0801k&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM41B-0801

Physics

2724 Magnetopause, Cusp, And Boundary Layers, 7827 Kinetic And Mhd Theory, 7835 Magnetic Reconnection, 7843 Numerical Simulation Studies

Scientific paper

We have investigated the consequences of both quasi-steady state as well as time-dependent magnetic reconnection at the dayside magnetopause using large-scale 2-D and 3-D simulations. We will present and contrast results from both multiple x-line (MXR) and single x-line (SXR) models of flux transfer events (FTEs) and demonstrate the role of kinetic effects as well as velocity shear in formation of intermittent reconnection. The plasma and magnetic signatures of the resulting FTEs are compared with observations. We have confirmed the existence of two distinct regions within a FTE, a central core and a field-draping region consistent with findings of Le et al., 1999 based on analysis of high-resolution data from the ISEE 2 spacecraft. Previous studies have used hybrid simulations to study the magnetopause structure resulting from quasi-steady state in 2-D. We will present the first 3-D hybrid simulations of the magnetopause structure and show how the resulting discontinuities are altered in 3-D. One of the persistent features of kinetic simulations is the formation of a large-scale BM component (boundary normal coordinates) that extends well beyond the scales of Hall-generated currents in Hall MHD. The physical reason for this and its consequences for both FTEs as well as magnetopause structure will be explained.

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