Simulation of Collisionless Reconnection: Embedding of Particle Hall-MHD Calculations Within a MHD Simulation

Details Simulation of Collisionless Reconnection: Embedding of Particle Hall-MHD Calculations Within a MHD Simulation Simulation of Collisionless Reconnection: Embedding of Particle Hall-MHD Calculations Within a MHD Simulation

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sm42b02y&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SM42B-02

Physics

2753 Numerical Modeling, 2764 Plasma Sheet, 7835 Magnetic Reconnection, 7843 Numerical Simulation Studies

Scientific paper

Collisionless reconnection involves both Hall physics and kinetic effects occurring at small scales in thin current sheets. Including these effects in a large scale MHD simulation is essential to correctly model the magnetotail dynamics during substorms. To address the issue of how kinetic treatment for the ions affects the reconnection dynamics, a study of two-dimensional collisionless reconnection in a thin current sheet is conducted using hybrid and Hall-MHD simulations that include the full electron pressure tensor in Ohm's law while neglecting resistivity and electron inertia. Comparison of fluid-ion and particle-ion dynamics demonstrates that off-diagonal elements of the ion pressure tensor are important to correctly model the ion out-of-plane momentum transport from the X point. It is shown that these effects can be modeled efficiently in Hall-MHD simulations in a predictor/corrector manner that uses particle ions to implement the ion gyro-radius corrections. We investigate the micro- macro-scale coupling in the tail dynamics using a new integrated approach in which particle Hall-MHD calculations are embedded inside a MHD simulation. The propagation of waves between the two regions both along and across the magnetic field are examined. Initial results of the embedded simulation concerning current sheet thinning and reconnection dynamics are discussed.

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