尘埃等离子体的引力非稳定性与凝聚效应  

Gravitational Instability and Condensation Effect of Dust Plasma

作　　者：杜九林[1] 葛德彪[1] 

机构地区：[1]西安电子科技大学理学院,西安710049

出　　处：《西安交通大学学报》2002年第2期208-210,共3页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目 (195 0 30 0 2 ;1970 10 2 1);陕西师范大学重点科研基金资助项目 (2 0 0 0 19)

摘　　要：从尘埃等离子体的基本方程出发 ,采用非平衡态动力学方法 ,研究了尘埃粒子的引力 (重力 )对尘埃等离子体宏观动力学的影响 ,具体分析了产生凝聚效应的条件及其相关性质 .结果表明 ,尘埃等离子体中存在一种由引力非稳定性产生的凝聚效应 ,从而导致局域密度增大 .这种效应可能与星际介质分子云及原始恒星的形成有关 。On the basis of fundamental equations of dust plasma, the influence of self gravitation or gravity of the dust particles on the macroscopic dynamics of dust plasma is investigated by using the nonequilibrium dynamical method. It is shown that there is a condensation effect in dust plasma that caused by the gravitational instability, so that the density increases locally. This condensation effect may be related to the formation of the molecular clouds in interstellar media and proto stars, as well as may influence the plasma processing in the laboratory. The conditions for producing the condensation effect and its characteristics are analysed in detail.

关 键 词：尘埃等离子体 凝聚效应 引力非稳定性 天体物理学 星际介质分子云 临界波长 

分 类 号：P142.83[天文地球—天体物理]