Particle orbits during the development of plasmoids

Details Particle orbits during the development of plasmoids Particle orbits during the development of plasmoids

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....9212181s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Nov. 1, 1987, p. 12181-12186.

Computer Science

Numerical Analysis

22

Electric Fields, Geomagnetic Tail, Magnetic Fields, Magnetohydrodynamic Waves, Particle Trajectories, Plasmas (Physics), Computerized Simulation, Numerical Analysis, Tearing Modes (Plasmas)

Scientific paper

Single-particle orbits are numerically followed in a time-dependent electric and magnetic field obtained from a two-dimensional magnetohydrodynamic simulation of bursty reconnection (Scholer and Roth, 1987). During the reconnection simulation, the reconnection rate at the original X point decreases, a long current sheet develops, and reconnection sets in again at a new pair of X points. This leads to the development of a plasmoid. Particles injected with parameters appropriate for the plasma sheet at the time of the secondary tearing close to the new X-points drift large distances parallel to the X-line and gain high energies. These particles are subsequently trapped on closed field lines in the developing plasmoid. Since the X-line has a limited extent, the acceleration mechanism leads to large dawn-dusk asymmetries. The resulting distribution function within the plasmoid at various cross-tail distances is computed. The distribution function is close to an exponential in velocity with a higher-energy cutoff; with increasing distance toward the duskside the e-folding velocity increases, and the high-energy cutoff shifts to larger energies.

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