3D Kinetic Simulations of the Onset of Collisionless Magnetic Reconnection

Details 3D Kinetic Simulations of the Onset of Collisionless Magnetic Reconnection 3D Kinetic Simulations of the Onset of Collisionless Magnetic Reconnection

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsh31a1076r&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SH31A-1076

Physics

2744 Magnetotail, 2788 Storms And Substorms, 7835 Magnetic Reconnection, 7843 Numerical Simulation Studies, 7871 Waves And Instabilities

Scientific paper

We study the onset of collisionless magnetic reconnection by performing kinetic simulations of Harris current sheets. Simulations of two-dimensional systems show that the saturation level of the tearing mode is very low if no initial perturbation is added. Two-dimensional simulations in the current aligned plane show the development of the fastest lower-hybrid drift instabilities on the electron gyroscale, followed by electromagnetic modes with wavelengths intermediate between the ion and the electron gyroscale and, finally, the velocity shear (non-linear consequence of the lower-hybrid modes) triggers a flapping mode that kinks the current sheet. Finally, we perform three-dimensional simulations to investigate the effect of the current aligned modes on the onset of the reconnection process. The simulations are performed with CELESTE3D, an implicit PIC suitable for large scale and high mass ratio simulations, and with a massively parallel explicit PIC code able to study in more detail the microphysical processes.

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