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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Polytropic index of magnetosheath ions based on homogeneous MHD Bernoulli Integral
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Polytropic index of magnetosheath ions based on homogeneous MHD Bernoulli Integral

机译：基于多变指数的磁鞘离子齐次磁流体动力伯努利积分

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This paper uses Cluster data during the period from 2001 to 2010 to study the polytropic processes of magnetosheath ions. Utilizing the method of homogeneous magnetohydrodynamic (MHD) Bernoulli integral (MBI), we first identify streamflow tubes, then use the constant of polytropic relation to guarantee that the streamflow tube experiences an unchanged polytropic process, and finally determine the polytropic index of ions in these streamflow tubes. The statistical results show that the magnetosheath is a complicated systemin which the polytropic index of ions ranges from ~2 to 3. The polytropic index distribution of ions is dependent on the electromagnetic energy flux perpendicular to the streamline. The median polytropic index of ions in the magnetosheath is 0.960, 0.965, and 0.974 for perpendicular electromagnetic energy ratio δ_(E × B)<5%, δ_(E × B)<3%, and δ_(E × B)<1%, respectively. There are two basic polytropic processes in the magnetosheath: the dominant isothermal process and the isobaric process. When there is no exchange of electromagnetic energy between neighboring streamflow tubes, the magnetosheath ions are isothermal. However, when the perpendicular electromagnetic energy ratio increases, the isobaric polytropic process starts to emerge. The magnetosheath ion flows are highly localized because most streamflow tubes experiencing same polytropic processes last less than 60 s. Thus, the polytropic index of magnetosheath ion flows is highly variable.
机译：本文使用集群数据期间从2001年到2010年研究多变磁鞘离子的过程。的方法均匀磁流体动力(磁流体动力)伯努利积分(MBI),我们首先要确定水流管道,然后使用的常数保证多方关系水流管经历一个不变多变过程,最后确定在这些河流多变指数的离子管。磁鞘是一个复杂的系统的离子的多变指数范围从~ 2到3。多变指数分布的离子依赖于电磁能量通量垂直于简化。多变指数的离子磁鞘中0.960、0.965和0.974垂直电磁能量比δ_ (E×B) < 5%,δ_ (E×B) < 3%,δ_ (E×B) < 1%。两种基本的多变过程的磁鞘:占主导地位的等温过程和等压过程。之间的电磁能量交换邻近河流管、磁鞘离子等温过程。垂直的电磁能量比例增加,等压多变过程就开始了出现。本地化,因为大多数河流管经历相同的多变过程持续减少60年代。磁鞘离子流动是高度可变的。

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