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首页> 外文期刊>Geophysical Research Letters >Magnetic double gradient mechanism for flapping oscillations of a current sheet
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Magnetic double gradient mechanism for flapping oscillations of a current sheet

机译：磁双梯度机制，用于振荡电流片

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摘要

A new kind of magnetohydrodynamic waves are analyzed for a current sheet in a presence of a small normal magnetic field component varying along the sheet. As a background, two simplified models of a current sheet are considered with a uniform and nonuniform current distributions in the current sheet. On a basis of these two models, the flapping-type waves are obtained which are related to a coexistence of two gradients of the tangential and normal magnetic field components along the normal and tangential directions with respect to the current sheet. A stable situation for the current sheet is associated with a positive result of the multiplication of the two magnetic gradients, and unstable ( wave growth) condition corresponds to a negative result of the product. In the stable region, the "kink''-like wave mode is interpreted as so called flapping waves observed in the Earth's magnetotail current sheet.
机译：在存在一个沿着板片变化的小的法向磁场分量的情况下，针对当前板片分析了一种新型的磁流体动力波。作为背景，考虑当前工作表的两个简化模型，其中当前工作表中的电流分布均匀且不均匀。在这两个模型的基础上，获得了与沿当前薄片的法线和切线方向的切线和法线磁场分量的两个梯度的共存有关的拍动型波。当前工作表的稳定情况与两个磁梯度的乘积的正结果相关，而不稳定（波动）条件对应于乘积的负结果。在稳定区域，类“扭结”波模式被解释为在地球磁尾电流片中观察到的所谓的拍动波。

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