Richard Louis, Sorriso-Valvo Luca, Yordanova Emiliya, Graham Daniel B, Khotyaintsev Yuri V
Swedish Institute of Space Physics, Uppsala 751 21, Sweden and Department of Physics and Astronomy, Space and Plasma Physics, Uppsala University, Uppsala 751 20, Sweden.
CNR/ISTP-Istituto per la Scienza e la Tecnologia dei Plasmi, 70126 Bari, Italy; Space and Plasma Physics, School of Electrical Engineering and Computer Science, KTH Royal Institute of Technology, Stockholm 114 28, Sweden; and Swedish Institute of Space Physics, Uppsala 751 21, Sweden.
Phys Rev Lett. 2024 Mar 8;132(10):105201. doi: 10.1103/PhysRevLett.132.105201.
We investigate turbulence in magnetic reconnection jets in the Earth's magnetotail using data from the Magnetospheric Multiscale spacecraft. We show that signatures of a limited inertial range are observed in many reconnection jets. The observed turbulence develops on the timescale of a few ion gyroperiods, resulting in intermittent multifractal energy cascade from the characteristic scale of the jet down to the ion scales. We show that at sub-ion scales, the fluctuations are close to monofractal and predominantly kinetic Alfvén waves. The observed energy transfer rate across the inertial range is ∼10^{8} J kg^{-1} s^{-1}, which is the largest reported for space plasmas so far.
我们利用磁层多尺度航天器的数据，研究了地球磁尾中磁重联喷流中的湍流。我们表明，在许多重联喷流中都观测到了有限惯性范围的特征。观测到的湍流在几个离子回旋周期的时间尺度上发展，导致从喷流的特征尺度到离子尺度的间歇性多重分形能量级串。我们表明，在亚离子尺度上，涨落接近单分形，且主要是动力学阿尔文波。观测到的跨惯性范围的能量传输率约为10^8 J kg^-1 s^-1，这是迄今为止报道的空间等离子体中最大的。
