Kinetic simulations of magnetic reconnection in plasma with different beta values

Details Kinetic simulations of magnetic reconnection in plasma with different beta values Kinetic simulations of magnetic reconnection in plasma with different beta values

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm51d..05b&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SM51D-05

Physics

7827 Kinetic And Mhd Theory, 7835 Magnetic Reconnection, 7843 Numerical Simulation Studies

Scientific paper

We present kinetic simulations of collisionless magnetic reconnection in Harris current sheets. We simulate plasmas with different beta values by varying the guide fields. For all values of β >me/m_i, fast reconnection is made possible by the separation of the electron and ion dynamics in the reconnection region. The primary mechanism that relaxes the frozen-in conditions is given by the non-gyrotropic electron pressure terms for all guide fields considered. The reconnection rate is then enhanced by the Whistler dynamics in high beta plasmas and by the Kinetic Alfvén Waves dynamics in lower beta plasmas. The guide field diminishes the reconnection rate and decreases the reconnection saturation level. The ion and electron flow pattern, acceleration, and heating are strongly influenced by the guide field. The simulations are performed by using two Particle-in-Cell codes: CELESTE3D, an implicit PIC code that runs on a single processor machine, and NPIC, a massive parallel explicit code that is able to resolve all the plasma time and length scales. The results of the two codes are compared in detail.

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