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无碰撞电流片哨声波不稳定性
Alternative TitleWhistler Instabilities in the Collisionless Current Sheet
周国成; 魏新华; 曹晋滨; 王德驹; 蔡春林; 北京8701信箱
Department空间天气学国家重点实验室
Source Publication空间科学学报
2005
Volume25Issue:3Pages:161-166
ISSN0254-6124
Language中文
Keyword哨声波 电流片 无碰撞 不稳定性 稳定性问题 惯性区 色散关系 一般形式 物理模型 数值求解 频率范围 斜传播 增长率 低频波 中性 离子 波数 电子
Abstract通过数值求解文献[4]中物理模型A得到的一般形式的色散关系,讨论了无碰撞电流片低频波不稳定性问题.结果表明,哨声波能被无碰撞电流片直接激发.在中性片上(z/di=0),在较宽的波数范围内,斜哨声波是可以传播的,但它基本上是稳定的.在离子惯性区内(z/di<1,电子惯性区外),斜传播的哨声波是不稳定的.在离子惯性区边缘(z/di=1),斜传播的哨声波仍然是不稳定的,增长率更大,不稳定的波频率范围更高.此外,朝向中性片方向传播(kzdi<0)的哨声波比离开中性片方向传播(kzdi>0)的哨声波有更大的增长率.
Other AbstractWhistler wave instabilities in the collisionless current sheet have been studies in the present paper by solving general dispersion relation obtained from the 2.5-dimenssional and incom-pressible MHD model (Physical model A) of the paper!4}. In this MHD model, the electron pressure tensor is used in the generalized Ohm's law. The results show that whistler waves can be directly excited by the collisionless current shee七.At the neutral sheet(z/di=0), whistler waves are basically stable in a broad range of wave number. Inside the ion inertial region (z/d;<1), obliquely propagat-ing whistler waves are unstable. At the edge of ion inertial region (w/d;=1), obliquely propagating whistler waves have larger growth rate and higher frequency range. Besides, waves propagating to- wards the neutral sheet (z/d;<0) have larger growth rate than that propagating away from the neutral sheet (z/di>0). There are two kinds of whistler waves: one with the parallel wave number larger and the other with the parallel wave number smaller than the perpendicular wave number.
Funding Project中国科学院空间科学与应用研究中心
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/1441
Collection空间科学部
Corresponding Author北京8701信箱
Recommended Citation
GB/T 7714
周国成,魏新华,曹晋滨,等. 无碰撞电流片哨声波不稳定性[J]. 空间科学学报,2005,25(3):161-166.
APA 周国成,魏新华,曹晋滨,王德驹,蔡春林,&北京8701信箱.(2005).无碰撞电流片哨声波不稳定性.空间科学学报,25(3),161-166.
MLA 周国成,et al."无碰撞电流片哨声波不稳定性".空间科学学报 25.3(2005):161-166.
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