Richard Louis, Khotyaintsev Yuri V, Graham Daniel B, Vaivads Andris, Gershman Daniel J, Russell Christopher T
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.
Swedish Institute of Space Physics, Uppsala 751 21, Sweden.
Phys Rev Lett. 2023 Sep 15;131(11):115201. doi: 10.1103/PhysRevLett.131.115201.
We present a statistical analysis of ion distributions in magnetic reconnection jets using data from the Magnetospheric Multiscale spacecraft. Compared with the quiet plasma in which the jet propagates, we often find anisotropic and non-Maxwellian ion distributions in the plasma jets. We observe magnetic field fluctuations associated with unstable ion distributions, but the wave amplitudes are not large enough to scatter ions during the observed travel time of the jet. We estimate that the phase-space diffusion due to chaotic and quasiadiabatic ion motion in the current sheet is sufficiently fast to be the primary process leading to isotropization.
我们利用磁层多尺度航天器的数据，对磁重联喷流中的离子分布进行了统计分析。与喷流传播所经过的平静等离子体相比，我们经常在等离子体喷流中发现各向异性和非麦克斯韦分布的离子。我们观测到与不稳定离子分布相关的磁场波动，但在喷流的观测传播时间内，波幅不足以散射离子。我们估计，由于电流片中离子的混沌和准绝热运动导致的相空间扩散足够快，足以成为导致各向同性化的主要过程。
