Energy Conversion through a Fluctuation–Dissipation Relation at Kinetic Scales in the Earth’s Magnetosheath

IF 4.8 2区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS
Federica Chiappetta, Emiliya Yordanova, Zoltán Vörös, Fabio Lepreti, Vincenzo Carbone
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引用次数: 0

Abstract

Abstract Low-frequency fluctuations in the interplanetary medium represent a turbulent environment where universal scaling behavior, generated by an energy cascade, has been investigated. On the contrary, in some regions, for example, the magnetosheath, universality of statistics of fluctuations is lost. However, at kinetic scales where energy must be dissipated, the energy conversion seems to be realized through a mechanism similar to the free solar wind. Here we propose a Langevin model for magnetic fluctuations at kinetic scales, showing that the resulting fluctuation–dissipation relation is capable of describing the gross features of the spectral observations at kinetic scales in the magnetosheath. The fluctuation–dissipation relation regulates the energy conversion by imposing a relationship between fluctuations and dissipation, which at high frequencies are active at the same time in the same range of scales and represent two ingredients of the same physical process.
地球磁鞘在动力学尺度上的波动-耗散关系的能量转换
行星际介质中的低频波动代表了一个湍流环境,在这个环境中,研究了由能量级联产生的普遍标度行为。相反,在某些区域,例如磁鞘,涨落统计的普适性就丧失了。然而,在动能尺度上,能量必须耗散,能量转换似乎是通过类似于自由太阳风的机制来实现的。本文提出了一个动力学尺度上磁波动的Langevin模型,结果表明,由此产生的波动-耗散关系能够描述磁鞘在动力学尺度上的光谱观测的总体特征。波动-耗散关系通过施加波动和耗散之间的关系来调节能量转换,这两种关系在高频时在同一尺度范围内同时活跃,代表同一物理过程的两个组成部分。
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来源期刊
Astrophysical Journal
Astrophysical Journal 地学天文-天文与天体物理
CiteScore
8.40
自引率
30.60%
发文量
2854
审稿时长
1 months
期刊介绍: The Astrophysical Journal is the foremost research journal in the world devoted to recent developments, discoveries, and theories in astronomy and astrophysics.
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