Chaos in the plasma sheet

Details Chaos in the plasma sheet Chaos in the plasma sheet

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18.1639g&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 18, Aug. 1991, p. 1639-1642.

Physics

11

Chaos, Current Sheets, Geomagnetic Tail, Plasma Layers, Solar Terrestrial Interactions, Electric Fields, Magnetopause, Nonadiabatic Conditions, Plasma Heating

Scientific paper

A simple dynamical model of the magnetotail is discussed, in which the electric field in the current sheet evolves in response to a solar-wind-induced electric field at the magnetopause, and depends on the specific entropy of the plasma in the plasma sheet. The entropy varies due to nonadiabatic heating in a region where ULF waves are absorbed by resonant mode conversion. The feedback between temperature and entropy change leads to an evolution which exhibits chaos when the solar wind electric field is neither very small nor very large. The onset of chaos may be quite sudden or may proceed through a sequence of period doublings.

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