Hybrid simulations of magnetic reconnection in asymmetric current sheets : the problem of the initial kinetic equilibrium

Details Hybrid simulations of magnetic reconnection in asymmetric current sheets : the problem of the initial kinetic equilibrium Hybrid simulations of magnetic reconnection in asymmetric current sheets : the problem of the initial kinetic equilibrium

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm31a1680a&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM31A-1680

Physics

2723 Magnetic Reconnection (7526, 7835), 2724 Magnetopause And Boundary Layers, 2753 Numerical Modeling, 7526 Magnetic Reconnection (2723, 7835 Magnetic Reconnection (2723, 7526)

Scientific paper

As one of the main phenomena allowing energy entry in the magnetosphere, magnetic reconnection has been heavily studied via in situ observations and theoretical investigations, numerical simulations playing an important role. For many years now, Harris' kinetic equilibrium (1962) has been extensively used to initiate current sheets simulations. If it can be considered as an approximation at the magnetotail, it can no longer be valid for magnetopause reconnection where asymmetries due to magnetosheath and magnetospheric plasma populations cannot be ignored. So far, kinetic simulations performed in such an asymmetric configuration have been initiated with fluid equilibrium conditions where the plasma is locally Maxwellian. A certain amount of time is therefore required for the distribution function to thermalize, involving pressure waves emission and slight modification of the first moments, during which magnetic reconnection is triggered via tearing mode instablity, magnetic perturbation or resistivity spot. In this work, we propose a study of magnetic reconnection within an magnetopause-like configuration with a hybrid kinetic equilibrium allowing density and temperature gradients. The Vlasov equilibrium is found via considerations on the constants of motion for the ion species within an antiparallel magnetic tangential discontinuity.

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