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Chaos and ion heating in a slow shock
Author(s) -
Lin Y.,
Lee L. C.
Publication year - 1991
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/91gl01611
Subject(s) - physics , mach number , shock wave , chaotic , mechanics , wavelength , shock (circulatory) , magnetic field , field (mathematics) , mach wave , magnetosphere particle motion , computational physics , particle (ecology) , classical mechanics , optics , quantum mechanics , geology , oceanography , mathematics , artificial intelligence , pure mathematics , computer science , medicine
Hybrid‐code simulations of slow shocks indicate that there exists a critical number, M c , such that slow shocks with an intermediate Mach number M I ≥ M c have a rotational wave train and slow shocks with M I < M c do not have such a wave train. We propose an ion heating mechanism of slow shocks, which is associated with the chaotic motion of particles in the downstream wave field. For a coherent electromagnetic wave propagating along the downstream magnetic field, corresponding to switch‐off shocks, the particle motions are not chaotic. For an oblique wave, the interaction between the particles and the wave field may lead to chaotic particle motions. Such particles may be greatly thermalized within one wavelength after they are incident into the downstream wave field. The results can be used to explain the existence of the critical intermediate Mach number observed in the hybrid simulations.