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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Ion Jets Within Current Sheets in the Martian Magnetosphere
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Ion Jets Within Current Sheets in the Martian Magnetosphere

机译：目前在火星表内离子喷射磁气圈

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摘要

Magnetic reconnection is often suggested to be implicated in a variety of dynamic phenomena observed in the complex magnetosphere of Mars.We present a first global survey of ion jets within current sheets, which are thought of as a primary product of magnetic reconnection, with Mars Atmosphere and Volatile EvolutioN (MAVEN) data obtained on the dayside and nightside in the Martian magnetosphere.We develop a fully automated algorithm to efficiently and reliably identify ion flow velocity deviations during current sheet crossings recorded by MAVEN. The obtained statistical results show that (i) sunward and anti-sunward ion jets embedded within current sheets are commonly and widely observed in the dayside and nightside magnetosphere of Mars, (ii) measured magnetic field profiles and inferred magnetic topology during the jet crossings are generally consistent with those expected for reconnecting current sheets, (iii) the jet occurrence is apparently independent of upstream driver conditions, and (iv) most of the identified current sheets are thin with a roughly ion scale half-thickness and are embedded in low beta plasma, suggesting that they are seemingly capable of reconnection based on the known onset conditions. The widespread distributions and common detection of ion jets, as well as the ubiquitous presence of thin, low-beta current sheets, imply that magnetic reconnection could operate frequently in many locations around Mars, thereby playing an important role in the dynamics of the Martian magnetosphere for most, if not all, of the solar wind conditions in the present epoch.
机译：磁重联通常是建议在内的各种动态的现象观察到的复杂的火星磁层。内的离子飞机第一次全球调查当前的床单,这被认为是主要的磁场重联的产品,火星大气和挥发性进化(MAVEN)数据获得的光面和阴面火星磁层。自动化算法来有效和可靠确定离子流动速度偏差当前表记录的口岸MAVEN。获得统计结果表明,(我)朝着太阳和anti-sunward离子飞机嵌入当前表通常和广泛的观察在昼和夜侧磁气圈火星,概要文件和(2)测量磁场在飞机推断磁拓扑过境点通常是一致的预计目前重新连接表,(3)飞机发生显然是独立的上游驱动条件,(iv)的大部分确定当前表与约薄离子规模half-thickness和嵌入低β等离子体,这表明它们表面上可以重新连接基于已知的发作条件。常见的离子检测飞机,以及无处不在的薄,低风险磁场重联表,暗示操作频繁的火星,很多地方从而发挥重要作用的动力学火星磁层的大多数,如果不是太阳风条件的,在当下时代。

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