Energy Conversion and Partition in Plasma Turbulence Driven by Magnetotail Reconnection

被引:10
|
作者
Li, Xinmin [1 ,2 ,3 ]
Wang, Rongsheng [1 ,2 ,3 ]
Huang, Can [4 ]
Lu, Quanming [1 ,2 ,3 ]
Lu, San [1 ,2 ,3 ]
Burch, J. L. [5 ]
Wang, Shui [1 ,2 ,3 ]
机构
[1] Univ Sci & Technol China, Sch Earth & Space Sci, Dept Geophys & Planetary Sci, CAS Key Lab Geospace Environm, Hefei 230026, Peoples R China
[2] CAS Ctr Excellence Comparat Planetol, Hefei 230026, Peoples R China
[3] Univ Sci & Technol China, Anhui Mengcheng Geophys Natl Observat & Res Stn, Mengcheng, Anhui, Peoples R China
[4] Chinese Acad Sci, Inst Geol & Geo5phys, Beijing 100029, Peoples R China
[5] Southwest Res Inst, San Antonio, TX USA
来源
ASTROPHYSICAL JOURNAL | 2022年 / 936卷 / 01期
基金
美国国家科学基金会;
关键词
MAGNETIC RECONNECTION; SOLAR-WIND; ELECTRIC-FIELD; ACCELERATION; DISSIPATION; CURRENTS; REGION;
D O I
10.3847/1538-4357/ac84d7
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
A long-outstanding issue in fundamental plasma physics is how magnetic energy is finally dissipated in kinetic scale in the turbulent plasma. Based on the Magnetospheric Multiscale mission data in the plasma turbulence driven by magnetotail reconnection, we establish the quantitative relation between energy conversion (J.E; J is current density and E is electric field) and current density (J). The results show that the magnetic energy is primarily released in the perpendicular directions (up to 90%), in the region with current density less than 2.3 J(rms), where J(rms) is the rms value of the total current density vertical bar J vertical bar. In the relatively weak current region (<1.0 J(rms)), the ions get most of the released energy while the largely negative energy conversion rate of the electrons means a dynamo action. In the strong currents (>1.0 J(rms)), the ion energization was negligible and the electrons are significantly energized. Moreover, a linearly increasing relationship was established between vertical bar J.E vertical bar and vertical bar J vertical bar. The observations indicate that ions overall dominate energy conversion in turbulence, but the electron dynamics are crucial for energy conversion in intense currents and the turbulence evolution.
引用
收藏
页数:7
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