Gyroresonance Between Electromagnetic Ion Cyclotron Waves and Particles in a Multi-ion Plasma

被引：0

作者：

贺慧勇 ^{[1
,2
]}

陈良旭 ^{[1
]}

田天 ^{[3
]}

贺艺华 ^{[1
]}

李亚捷 ^{[1
]}

聂六英 ^{[1
]}

机构：

[1] School of Physics and Electronic Sciences,Changsha University of Science and Technology

[2] State Key Laboratory of Space Weather

[3] School of Earth and Space Sciences,Peking

来源：

Plasma Science and Technology | 2009年 / 11卷 / 05期

关键词：

D O I：

暂无

中图分类号：

学科分类号：

摘要：

<正> The gyroresonant interaction between electromagnetic ion cyclotron （EMIC） wavesand energetic particles was studied in a multi-ion （H+, He+, and O+） plasma. The minimumresonant energy Emin, resonant wave frequency ω, and pitch angle diffusion coefficient Dαα werecalculated at the center location of the symmetrical ring current: r 3.5RE with RE the Earth'sradius. Emin is found to decrease rapidly from 10 MeV to a few keV with the increase in ω in threebands: H+-band, He+-band and O+-band. Moreover, EMIC waves have substantial potential toscatter energetic （～100 keV） ions （mainly H+ and He+） into the loss cone and yield precipitationloss, suggesting that wave-particle interactions contribute to ring current decay.

引用

页码：539 / 543

页数：5

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