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
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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.
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页码：539 / 543
页数：5
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