Thunder and Drag: The Impact of Electron Holes in 3-D Magnetic Reconnection

Details Thunder and Drag: The Impact of Electron Holes in 3-D Magnetic Reconnection Thunder and Drag: The Impact of Electron Holes in 3-D Magnetic Reconnection

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsm21b..11s&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SM21B-11

Physics

2712 Electric Fields (2411), 2740 Magnetospheric Configuration And Dynamics, 2753 Numerical Modeling, 2772 Plasma Waves And Instabilities

Scientific paper

When allowed to evolve in three spatial dimensions, collisionless magnetic reconnection develops notable features not seen in planar simulations. In particular, when a guide field is present electrons can be strongly accelerated parallel to the magnetic field. They and the ions become Buneman unstable and evolve non-linearly into intense, concentrated, bipolar electric fields. Since these regions are positively charged (that is, electron holes), they repel ions as they propagate which then recollapse in the hole's wake, exciting acoustic oscillations --- magnetospheric thunder. Furthermore, as seen in recent 1-D simulations, the holes scatter the electrons in velocity space, which in turns leads to qualitative, and possibly quantitative, changes in the reconnection dynamics.

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