Simulation of feedback instability in the coupled magnetosphere-ionosphere system

Hiroki Hasegawa; Nobuaki Ohno; Tetsuya Sato

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Simulation of feedback instability in the coupled magnetosphere-ionosphere system

机译：模拟反馈耦合的不稳定magnetosphere-ionosphere系统

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Quiet auroral arcs formation has been investigated theoretically and numerically in a self-consistent dynamic way. By using a three-dimensional magneto-hydro-dynamics simulation of a dipole magnetosphere-ionosphere coupling system, it is shown that multiple longitudinally striated structures of the ionospheric plasma density and the fieldaligned current are formed, resulting from nonlinear feedback instability. The areas where these structures appear are consistent with the prediction by the integrated feedback theory that includes the effects of the spatially non-uniform electric field and non-uniform plasma density. Effects of the difference of the field line lengths between the ionosphere and the magnetospheric equator over the auroral latitudes are also discussed on the feedback instability.

机译：安静的极光弧的形成已经调查理论上和数值有条理的动态方法。三维magneto-hydro-dynamics偶极子magnetosphere-ionosphere的模拟耦合系统,结果表明,多个纵向条纹结构的电离层等离子体密度和fieldaligned当前的形成,产生的非线性反馈的不稳定。结构出现是一致的理论预测的综合反馈包括空间不均匀的影响电场和非均匀等离子体密度。字段的不同线的影响长度和电离层之间在极光纬度磁性层的赤道还讨论了在反馈的不稳定。

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来源
《Journal of Geophysical Research, A. Space Physics: JGR》 |2010年第8期|A08304:1-A08304:10|共10页
作者
Hiroki Hasegawa; Nobuaki Ohno; Tetsuya Sato;
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作者单位

Earth Simulator Center. Japan Agency for Marine-Earth Science and Technology, Yokohama. Japan.;

Institute for Research on Earth Evolution, Japan Agency for Marine-Eanh Science and Technology, Yokohama, Japan.;

University of Hyogo, Kobe, Japan.;

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正文语种英语
中图分类空间物理;
关键词
magnetosphere-ionosphere coupling; plasma density; FeedbackAURORAL ARCSsimulatinguniform electric field;

机译：磁层-电离层耦合;等离子体密度;反馈AURORAL ARC模拟均匀电场;

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Simulation of feedback instability in the coupled magnetosphere-ionosphere system

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