Force balance near an X line along which E x J is less than 0

Details Force balance near an X line along which E x J is less than 0 Force balance near an X line along which E x J is less than 0

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....97.2955l&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A3, March 1, 1992, p. 2955-2960. Research supported by Aerospace

Physics

6

Earth Magnetosphere, Geomagnetic Tail, Particle Trajectories, Plasma-Particle Interactions, Solar Wind, Space Plasmas, Collisionless Plasmas, Distribution Functions, Flux Transfer Events, Magnetic Field Reconnection

Scientific paper

Conditions for which particle motion within the current sheet in the vicinity of an X line can give a current in the direction appropriate for E x J is less than 0. The way in which the balance between gyroviscosity and the electric force along an X line is maintained for any E x J is shown. It is concluded that observational evidence for the occasional existence of E x J is less than 0 along an X line provides support for the suggestion that collisionless graviscosity, rather than resistivity, balances the electric force along an X line. It is found that there is a maximum electric field magnitude for particles to be able to carry a significant current. For parameters typical of the distant magnetotail, the critical electric field magnitude was found to be about 0.15 mV/m, which is of the order of, though somewhat less than, the potential electric field magnitudes expected in the magnetotail. This maximum allowable field magnitude is about the same for protons as it is for electrons in the magnetotail.

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