Control of periodic variations in Saturn's magnetosphere by compressional waves

Control of periodic variations in Saturn's magnetosphere by compressional waves
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压缩波控制土星磁层的周期性变化

DOI:
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发表时间:
2014
期刊:
影响因子:
--
通讯作者:
X. Jia
X. Jia
中科院分区:
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文献类型:
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作者:
M. Kivelson;X. Jia

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在土星磁层中观察到的许多周期性变化可以直接与场向电流的旋转模式的存在联系起来,场向电流将北方和南方的电离层相互联系起来,并与磁层联系起来。这样的电流系统被纳入磁流体动力学模拟,以前已被证明重现许多观察到的系统的周期性特性。在这里,模拟是用来调查的一系列现象,可以归因于从旋转电流源发射的压缩波的影响。压缩波驱动等离子体片的拍动和磁层顶的膨胀和收缩。由于压缩扰动在磁层昼侧从早到晚的旋转过程中减弱,边界发展出强烈的早晚不对称性。提供的形状拟合可能有助于进一步研究磁层顶特性,但在Clarke等人(2010 a)的观测中已经有证据表明这种不对称性。
Many of the periodic variations observed in Saturn's magnetosphere can be linked directly to the presence of a rotating pattern of field‐aligned currents that link the northern and southern ionospheres with each other and with the magnetosphere. Such a current system is incorporated in a magnetohydrodynamic simulation that has previously been shown to reproduce many of the observed periodic properties of the system. Here the simulation is used to investigate a range of phenomena that can be attributed to the effects of compressional waves launched from the rotating current sources. The compressional waves are found to drive the flapping of the plasma sheet and the expansion and contraction of the magnetopause in each rotation period. Because the compressional perturbations weaken as they rotate from morning to evening around the dayside of the magnetosphere, the boundary develops a strong morning‐evening asymmetry. A fit to the shape is provided that may be useful in further investigation of magnetopause properties, but there is already evidence of the proposed asymmetry in the observations of Clarke et al. (2010a).
土星赤道磁层中行星周期附近的磁场振荡:振幅和相位随径向距离和当地时间的变化
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发表时间: 2010
期刊: Space Physics
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