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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Imprints of Quasi-Adiabatic Ion Dynamics on the Current Sheet Structures Observed in the Martian Magnetotail by MAVEN
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Imprints of Quasi-Adiabatic Ion Dynamics on the Current Sheet Structures Observed in the Martian Magnetotail by MAVEN

机译：准绝热的离子动力学的痕迹当前表结构中观察到火星MAVEN磁尾的

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摘要

Numerous studies of the current sheets (CS) in the Earth’s magnetotail showed that quasi-adiabatic ion dynamics plays an important role in the formation of complicated multilayered current structures. In order to check whether the similar mechanisms operate in the Martian magnetotail, we analyzed 80 CS crossings using MAVEN measurements on the nightside of Mars at radial distances ~1.0–2.8R_M. We found that CS structures experience similar dependence on the value of the normal component of the magnetic field at the neutral plane (B_N) and on the ratio of the ion drift velocity outside the CS to the thermal velocity (V_T/V_D) as it was observed for the CSs in the Earth’s magnetotail. For the small values of B_N, a thin and intense CS embedded in a thicker one is observed. The half-thickness L of this layer is ~30–100 km ≤ ρ_H+ (ρ_(H+) is a gyroradius of thermal protons outside the CS). With the increase of B_N, the L also increases up to several hundred kilometers (~ρ_(O+), ρ_(O2+)), the current density decreases, and the embedding feature disappears. Our statistical analysis showed a good agreement between L values observed by MAVEN and the CS scaling obtained from the quasi-adiabatic model, if the plasma characteristics in Martian CSs are used as input parameters. Thus, we may conclude that in spite of the differences in magnetic topology, ion composition, and plasma thermal characteristics observed in the Earth’s and Martian magnetotails, similar quasi-adiabatic mechanisms contribute to the formation of the CSs in the magnetotails of both planets.
机译：许多研究当前的表(CS)地球磁尾表明准绝热的离子动力学中起着重要的作用形成复杂的多层电流结构。在火星磁尾机制运作,我们分析了80 CS口岸使用MAVEN测量在火星的阴面径向距离r_m -2.8 ~ 1.0。经历相似的值的依赖的磁场的正常组成部分中性面(B_N)和离子的比例热漂移速度在CS速度(V_T / V_D)是观察到的CSs在地球磁尾。B_N,薄和强烈的CS嵌入厚的观察。这一层~ 30 - 100公里≤ρ_H +(ρ_ (H +)回转半径以外的热质子CS)。与L B_N的增加,也增加了到数百公里~ρ_ (O +),ρ_ (O2 +)),电流密度减小,嵌入功能消失了。显示L值之间一个好的协议通过MAVEN和CS缩放得到的准绝热的模型,如果等离子体火星作为输入使用CSs的特征参数。磁性差异的拓扑中,离子组成,和等离子热特性在地球和火星磁尾,类似的准绝热的机制做出贡献CSs的磁尾的形成这两个行星。

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