A HYBRID SIMULATION OF CONTACT DISCONTINUITY

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Title:	A HYBRID SIMULATION OF CONTACT DISCONTINUITY
Authors:	WU,BH;CHAO,JK;TSAI,WH;LIN,Y;LEE,LC
Contributors:	太空科學研究所
Keywords:	TANGENTIAL DISCONTINUITIES;MAGNETOPAUSE;RECONNECTION;LAYER
Date:	1994
Issue Date:	2010-06-29 18:40:23 (UTC+8)
Publisher:	中央大學
Abstract:	Contact discontinuities in a collisionless plasma are studied by hybrid simulations, in which ions are treated as particles and electrons are considered as a fluid. It is demonstrated that contact discontinuity with a stable density ramp can exist in cases with a finite electron temperature. An electron pressure gradient is present across the contact discontinuity, leading to the presence of a parallel electric field and hence field-aligned potential increase (DELTAPHI(parallel-to)) in the transition region. By reflecting ions at the discontinuity, this parallel electric potential peak reduces the interpenetration between hot and cold ions and maintains a stable density ramp across the contact discontinuity. The ratio of the field-aligned electric potential energy to ion thermal energy, eDELTAPHI(parallel-to)/kT(i), is found to be an increasing function of T(e)/T(i), where T(e) and T(i) are respectively the electron and ion temperature.
Relation:	GEOPHYSICAL RESEARCH LETTERS
Appears in Collections:	[Graduate Institute of Space Science] journal & Dissertation

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