Consequences of chaotic particle motion for the stability of space plasma current sheets

Details Consequences of chaotic particle motion for the stability of space plasma current sheets Consequences of chaotic particle motion for the stability of space plasma current sheets

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993ppcn.conf..105b&link_type=abstract

In ESA, Fourth International Toki Conference on Plasma Physics and Controlled Nuclear Fusion p 105-110 (SEE N94-22624 05-75)

Physics

Plasma Physics

Collisionless Plasmas, Magnetohydrodynamic Stability, Nonadiabatic Theory, Plasma Currents, Space Plasmas, Earth Magnetosphere, Geomagnetic Tail, Magnetic Field Configurations, Random Processes

Scientific paper

The influence of a transition of thermal electrons to chaos and quasi adiabaticity on the large scale stability properties of collisionless plasma current sheets is investigated. A hybrid model which describes large scale plasma and field dynamics by a set of Magnetohydrodynamic (MHD) equations is developed, the non adiabatic response of particles in the neutral sheet is considered kinetically. Using the microscopic theory of chaotic particle motion the MHD is modified. The stability properties of two dimensional current sheet equilibria if the chaos parameter k(sub e) becomes unity are investigated. It is shown that even if electrons become chaotic the growth time of a collisionless tearing mode instability of thick current sheets is too large in order to explain substorm expansions in the Earth's magnetospheric tail. Critical thinning of the sheet is shown to lead to a quickly growing instability.

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