Earthward-Tailward Asymmetry of Plasma Temperature in Reconnection Outflow in Earth's Magnetotail

IF 2.6 2区 地球科学 Q2 ASTRONOMY & ASTROPHYSICS Journal of Geophysical Research: Space Physics Pub Date : 2024-11-02 DOI:10.1029/2024JA032835
Fekireselassie Beyene, Vassilis Angelopoulos, Andrei Runov, Anton Artemyev
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Abstract

To explore the asymmetry in ion and electron heating at Earth's magnetotail at mid-tail distances ( X GSM < ${X}_{\mathit{GSM}}< $ −30 R E ${R}_{E}$ ), we analyze near-simultaneous observations of reconnection outflows from two opposite sides of reconnection sites at those distances using Magnetospheric Multiscale (MMS) and Acceleration, Reconnection, Turbulence and Electrodynamics of Moon's Interaction with the Sun (ARTEMIS) data. We report a pronounced temperature asymmetry between the earthward and tailward reconnection outflows. The asymmetry is more significant for electrons than for ions: Earthward moving ions are only three times hotter than tailward ones, but earthward moving electrons are 5–20 times hotter than tailward ones. The closed field-line topology on the earthward side of the reconnection region, as opposed to the open topology on the tailward side, is likely a critical contributor to this asymmetry. These findings cast light on the underlying mechanisms of particle heating and energization in magnetotail reconnection, highlighting the significant role of Earth's dipolar magnetic field. This study offers insights for refining magnetic reconnection models, emphasizing the importance of incorporating realistic magnetic field topologies to accurately simulate the heating and energization processes observed in space plasma environments.

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地球磁尾再连接外流中等离子体温度的地尾不对称现象
为了探索中尾距离(X GSM < ${X}_{\mathit{GSM}}<; $ -30 R E ${R}_{E}$ ),我们利用磁层多尺度(MMS)和月球与太阳相互作用的加速、再连接、湍流和电动力学(ARTEMIS)数据,分析了在这些距离上对来自再连接点两侧的再连接外流的近同步观测。我们报告了向地再连接外流和向尾再连接外流之间明显的温度不对称性。对电子而言,这种不对称性比对离子更为显著:向地运动的离子温度仅是向尾运动的离子温度的三倍,但向地运动的电子温度是向尾运动的电子温度的 5-20 倍。再连接区域向地一侧的封闭场线拓扑结构与向尾一侧的开放拓扑结构相比,很可能是造成这种不对称的关键因素。这些发现揭示了磁尾再连接中粒子加热和通电的基本机制,突出了地球偶极磁场的重要作用。这项研究为完善磁再连接模型提供了启示,强调了纳入现实磁场拓扑结构以准确模拟空间等离子体环境中观测到的加热和通电过程的重要性。
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来源期刊
Journal of Geophysical Research: Space Physics
Journal of Geophysical Research: Space Physics Earth and Planetary Sciences-Geophysics
CiteScore
5.30
自引率
35.70%
发文量
570
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