Neutral line chaos and phase space structure

Details Neutral line chaos and phase space structure Neutral line chaos and phase space structure

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18.1591b&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 18, Aug. 1991, p. 1591-1594. Research supported by Research Corp.

Physics

18

Chaos, Neutral Sheets, Particle Motion, Plasma-Particle Interactions, Current Sheets, Electric Fields, Magnetic Moments, Phase-Space Integral

Scientific paper

Phase space structure and chaos near a neutral line are studied with numerical surface-of-section (SOS) techniques and analytic methods. Results are presented for a linear neutral line model with zero crosstail electric field. It was found that particle motion can be divided into three regimes dependening on the value of the conserved canonical momentum, Py, and the conserved Hamiltonian, h. The phase space structure, using Poincare SOS plots, is highly sensitive to bn = Bn/B0 variations, but not to h variations. It is verified that the slow motion preserves the action, Jz, as evaluated by Sonnerup (1971), when the period of the fast motion is smaller than the time scale of the slow motion. Results show that the phase space structure and particle chaos depend sensitively upon Py and bn, but are independent of h.

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