Two-fluid model of magnetosonic solitons and shocks

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题名:	Two-fluid model of magnetosonic solitons and shocks
作者:	Hau,LN
贡献者:	太空科學研究所
关键词:	NUMBER PERPENDICULAR SHOCKS;COLLISIONLESS SHOCK
日期:	1998
上传时间:	2010-06-29 18:39:08 (UTC+8)
出版者:	中央大學
摘要:	A nearly perpendicular shock with a thickness on the order of electron inertial lengths has been reported recently by Newbury and Russell (Geophys. Res. Lett., vol. 23, pp. 781-784, 1996) based on the study of ISEE-1 and -2 crossings of Earth's bow shock. This paper examines the structure of nonlinear solitons and shocks propagating exactly perpendicular to the magnetic field based on the two-fluid model. It is shown that the characteristics of the solutions are distinct for three parameter regimes of the upstream plasma beta, beta(1), and magnetosonic number, M-ms1. Magnetosonic solitons and purely resistive subcritical shocks with or without downstream magnetosonic wavetrains exist only for low beta(1) and M-ms1. For subcritical shocks with intermediate beta(1) and M-ms1, steady solutions exist only for resistivity greater than certain critical values. For subcritical shocks with smaller resistivity and for supercritical shocks thigh beta(1) and M-ms1), resistivity alone is insufficient to yield shock transitions. Including viscosity in the model calculations however leads to solutions of unstable upstream and downstream states. This chaotic nature may account for the highly turbulent structure of the observed thin shock.
關聯:	GEOPHYSICAL RESEARCH LETTERS
显示于类别:	[太空科學研究所 ] 期刊論文

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