Large-scale structures in the interstellar medium

被引：0
|
作者：
Katz, ME
Yacobi, VM
机构：
[1] Mortimer and Raymond Sackler Institute of Advanced Studies, School of Physics and Astronomy, Tel-Aviv University, Ramat Aviv 69978, Tel Aviv
来源：
ASTROPHYSICAL JOURNAL | 1997年 / 483卷 / 01期
关键词：
hydrodynamics; ISM; structure; MHD; turbulence;
D O I：
10.1086/304212
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Large-scale ordered structures in the interstellar medium (ISM) are commonly explained as a manifestation of the various instabilities inherent to the motion of partially ionized, magnetized interstellar gas. We examined the process of creation of large-scale coherent eddy structures in the ISM characterized by the existence of fully developed small-scale turbulence with nonzero values of the hydrodynamic and magnetic helicities. The instability analysis shows that in such media large-scale ordered structures with characteristic scale l similar to 1-100 pc are generated. The generation coefficient of large-scale structures is determined by both the value of the hydrodynamic helicity and the combined influence of the drag force and magnetic helicity.
引用
收藏
页码：274 / 281
页数：8
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