Sudden impulse observations in the dayside magnetosphere by THEMIS

A. A. Samsonov; D. G. Sibeck; B.M.WalshN. V. Zolotova

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Sudden impulse observations in the dayside magnetosphere by THEMIS

机译：冲动的光面的观察磁气圈,忒弥斯

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We present a study of the magnetospheric response to interplanetary shocks. We show eight events with simultaneous observations of sudden impulses in the dayside magnetosphere and interplanetary shocks in the solar wind. The spacecraft measurements in the equatorial plane, even those very close to the Earth, can be interpreted in terms of the vortices predicted by previous studies employing global MHD models. In fact, these vortices are velocity oscillations with the properties of Alfvén waves. The amplitude and frequency of the oscillations depend on radial distance from the Earth. The amplitude of the velocity perturbations decreases with increase of the density and magnetic field magnitude, but the velocity amplitude shows no dependence on magnitude of the solar wind dynamic pressure change attending the interplanetary shocks. The oscillations are observed both in the outer magnetosphere and the plasmasphere, but they become less sinusoidal near the plasmapause, i.e., in the region with a large-density gradient. The amplitude of the magnetic field enhancement in the sudden impulses also depends on the radial distance. The MHD simulations successfully predict the amplitudes of magnetic field increase and the first cycles of the velocity oscillations in these events.

机译：我们目前的研究磁性层的响应星际的冲击。同时观测的突然的冲动在磁层的光面和星际在太阳风的冲击。在赤道平面测量,即使是那些非常接近地球,可以解释之前预测的漩涡研究采用全球磁流体动力模型。这些漩涡速度振荡阿尔芬波的性质。振荡频率取决于径向地球的距离。速度扰动随增加而减小密度和磁场大小,但是速度振幅没有依赖太阳风动压的大小改变参加星际的冲击。在外部振荡都观察到磁气圈和等离子体层,但他们变得不那么正弦等离子体层顶附近,也就是说,在该地区large-density梯度。突然冲动的增强也视情况而定在径向距离。成功地预测磁的振幅场和第一个周期的增加在这些事件速度振荡。

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来源
《Journal of Geophysical Research, A. Space Physics: JGR》 |2014年第12期|9476-9496|共21页
作者
A. A. Samsonov; D. G. Sibeck; B.M.WalshN. V. Zolotova;
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作者单位

Space Sciences Laboratory, University of California, Berkeley, California, USA;

Saint Petersburg State University, Saint Petersburg, Russia;

NASA Goddard Space Flight Center, Greenbelt, Maryland, USA;

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正文语种英语
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关键词
velocity perturbation; speed; interplanetary shock wavesAmplitudetopsoilplasmaspheremagnetic fieldplasmapauseEarthsimulatingperturbation;

机译：速度扰动;速度;星际冲击wavesAmplitudetopsoilplasmaspheremagneticfieldplasmapauseEarthsimulatingperturbation;

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Sudden impulse observations in the dayside magnetosphere by THEMIS

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