Physics – Geophysics
Scientific paper
Apr 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....99.5935p&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A4, p. 5935-5941
Physics
Geophysics
60
Collisionless Plasmas, Geomagnetic Tail, Magnetic Field Reconnection, Magnetospheric Instability, Plasma Equilibrium, Tearing Modes (Plasmas), Computerized Simulation, Current Sheets, Geophysics, Magnetic Fields, Plasma Dynamics, Two Dimensional Models
Scientific paper
Analytic theory has yielded contradictory predictions regarding the stabilizing role of electron dynamics on the collisionless tearing instability in a field-reversal region with finite normal magnetic field component B(sub z). Two-dimensional (x,z) simulations in which both electrons and ions are treated as particles demonstrate that, for the case of thin current sheets (R(sub i)/lambda is approximately 1, where R(sub i) is the ion Larmor radius based on the lobe field and lambda is the current sheet half thickness) and with weakly chaotic electron orbits, the ion tearing mode is indeed stabilized under the mild condition that kp(sub e) less than or approximately 1, where p(sub e) is the electron Larmor radius in the B(sub z) field.
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