Structure and length scales of rotational discontinuities

Details Structure and length scales of rotational discontinuities Structure and length scales of rotational discontinuities

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.3907k&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A3, p. 3907-3917.

Physics

18

Geomagnetism, Magnetic Field Reconnection, Magnetohydrodynamic Stability, Magnetospheric Electron Density, Rotating Plasmas, Gyromagnetism, Hall Effect, Magnetohydrodynamic Waves

Scientific paper

Results are presented of a series of 1D hybrid (kinetic ions and fluid electrons) simulations, using a nondynamic method to form rotational discontinuities (RDs) at an angle of 60 deg between the normal direction and the upstream magnetic field. Ion kinetic effects are found to be important with regard to the stability of the current layer, its thickness and scaling, and its dependence on initial conditions. A detailed examination of the downstream wave train and gradient scale size showed that RDs with alpha1 = +/-180 deg are stable within the framework of the simulation. With proper initialization, electron-sense rotations of -270 deg were found that do not disintegrate immediately but rather appear to consist of a superposition of a solitary wave with -360-deg rotation and a 90-deg ion-sense rotation.

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