Electron pressure effects on driven auroral Alfvén waves

Jorgen Vedin; Kjell Ronnmark

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Electron pressure effects on driven auroral Alfvén waves

机译：对驱动的极光阿尔芬电子压力的影响波

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Fluid models for the auroral electron acceleration processes have almost exclusively been derived by assuming cold or isothermal electrons. The consequences of these assumptions have never been thoroughly analyzed. In this study we compare results from an isothermal simulation with those obtained when the pressure is calculated from a double adiabatic approximation and from stationary kinetic theory. We find that the reflection of shear Alfvén waves, as well as the current-voltage relation, is very sensitive to the description of the electron pressure variations. Using pressures calculated from steady-state kinetic theory, we find that driven shear Alfvén waves can build up auroral currents and fields that are consistent with a linear current-voltage relation.

机译：流体模型极光电子加速度过程几乎完全是派生的如果感冒或等温电子。这些假设从来没有的后果彻底的分析。从一个等温模拟与结果当压力计算获得绝热近似和的两倍静止的动力学理论。反映剪切阿尔芬波,以及电流电压关系,是非常敏感的描述电子的压力变化。稳态动力学理论,我们发现驱动的剪切阿尔芬波可以建立极光电流和一个线性的字段是一致的电流电压关系。

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来源
《Journal of Geophysical Research, A. Space Physics: JGR》 |2005年第1期|A01214-1-A01214-11-0|共11页
作者
Jorgen Vedin; Kjell Ronnmark;
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作者单位

Department of Physics, Umea University, Umea, Sweden;

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原文格式 PDF
正文语种英语
中图分类
关键词
Reflection; Fluid; Alfven wavewaveselectron pressure;

机译：反射;流体;阿尔芬wavewaveselectron压力;

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Electron pressure effects on driven auroral Alfvén waves

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