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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >AlfvénWave Generation by a Compact Source Moving on the Magnetopause: Asymptotic Solution
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AlfvénWave Generation by a Compact Source Moving on the Magnetopause: Asymptotic Solution

机译：AlfvenWave一代移动一个紧凑的来源在磁层:渐近解

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摘要

The spatiotemporal structure of Alfvén waves excited by a moving pressure pulse on the magnetopause is analytically explored. These waves are supposed to be responsible for field-aligned currents generating traveling convection vortices in the ionosphere. It is found that a moving source generates two wave modes, a primary and a secondary mode, having different azimuthal wave vectors and frequencies. Both modes represent surface waves with amplitudes exponentially decreasing from the magnetopause. At a given azimuthal location, they also decrease with time as the source passes away. For the primary mode, the wave frequency equals the Alfvén resonant frequency on the surface of the source, while for the secondary mode the frequency equals the local resonant frequency. The dependence of the frequency of the secondary mode on the radial coordinate results in phase mixing, which leads to a change of the wave polarization from mixed into toroidal polarization. For both primary and secondary modes, the azimuthal component of the wave vector equals the corresponding wave frequency divided by the speed of the source. Superposition of the primary and secondary modes produces plasma vortices behind the source.
机译：阿尔芬波的时空结构兴奋通过一个移动的压力脉冲磁层分析探索。应该是负责field-aligned电流生成旅行在电离层对流漩涡。发现一个移动源生成两个波模式,主要和次要模式,拥有不同方位的波向量和频率。两种模式代表了表面波振幅指数降低的磁层。也随时间减少源传递走了。等于的阿尔芬共振频率表面的源,而二次模式的频率等于当地的共振频率。二级模式的径向坐标的结果在混合阶段,导致的变化从混合波极化成环形极化。模式,波矢的方位组件等于相应的波频率分裂源的速度。主要和次要模式产生等离子体漩涡背后的来源。

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