NONLINEAR EXCITATION OF LANGMUIR AND ALFVEN WAVES BY AURORAL WHISTLER WAVES IN THE PLANETARY MAGNETOSPHERE

被引：0

作者：

CHIAN, ACL ^{[1
]}

LOPES, SR ^{[1
]}

ALVES, MV ^{[1
]}

机构：

[1] NATL INST SPACE RES, INPE, BR-12227900 SAO JOSE DOS CAMPOS, SP, BRAZIL

来源：

ASTRONOMY & ASTROPHYSICS | 1994年 / 288卷 / 03期

关键词：

PLASMAS; INSTABILITIES; EARTH; PLANETS AND SATELLITES; GENERAL;

D O I：

暂无

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A new excitation mechanism of auroral Langmuir and Alfven waves in the planetary magnetosphere is proposed. It is shown that a large-amplitude electromagnetic whistler wave propagating along the magnetic field lines can nonlinearly generate Langmuir and Alfven waves through three-wave parametric instabilities, provided the interacting waves satisfy the phase matching and wave helicity conservation conditions. The proposed mechanism can account for the observation of Langmuir-Alfven-whistler (LAW) auroral events in the Earth's magnetosphere. It is suggested that similar parametric processes are likely to occur in other field-aligned current regions of astrophysical plasmas wherein the electron plasma frequency is of the order of or less than the electron cyclotron frequency.

引用

页码：981 / 984

页数：4

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