Study of inertial kinetic Alfven waves around cusp region

被引：12

作者：

Agarwal, P. ^{[1
]}

Varma, P. ^{[1
]}

Tiwari, M. S. ^{[1
]}

机构：

[1] Dr HS Gour Cent Univ, Dept Phys & Elect, Sagar 470003, MP, India

来源：

PLANETARY AND SPACE SCIENCE | 2011年 / 59卷 / 04期

关键词：

Inertial kinetic Alfven waves; Cusp region; Wave-particle interaction; Kinetic theory; Magnetosphere-ionosphere coupling; HIGH-ALTITUDE CUSP; LOSS-CONE DISTRIBUTION; ION-CYCLOTRON INSTABILITY; PARTICLE ASPECT ANALYSIS; SHEET BOUNDARY-LAYER; AURORAL FIELD LINES; POLAR CUSP; ELECTRON ACCELERATION; CLUSTER OBSERVATIONS; FREQUENCY WAVES;

D O I：

10.1016/j.pss.2010.11.006

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The effect of electron inertia on kinetic Alfven wave has been studied. The expressions for the dispersion relation, growth/damping rate and growth/damping length of the inertial kinetic Alfven wave (IKAW) are derived using the kinetic approach in cusp region. The Vlasov-kinetic theory has been adopted to evaluate the dispersion relation, growth/damping rate and growth/damping length with respect to the perpendicular wave number k(perpendicular to)rho(i) (rho(i) is the ion gyroradius) at different plasma densities. The growth/damping rate and growth/damping length are evaluated for different m(e)/beta m(i), where beta is the ratio of electron pressure to the magnetic field pressure, m(i, e) are the mass of ion and electron, respectively, as I=m(e)/beta m(i) represent boundary between the kinetic and inertial regimes. It is observed that frequency of inertial kinetic Alfven wave (IKAW) omega is decreasing with k(perpendicular to)rho(i) and plasma density. The polar cusp is an ideal laboratory for studies of nonlinear plasma processes important for understanding the basic plasma physics, as well as the magnetospheric and astrophysical applications of these processes. (C) 2010 Elsevier Ltd. All rights reserved.

引用

页码：306 / 311

页数：6

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