Electrostatic Turbulence and Debye-scale Structures in Collisionless Shocks
作者: R. WangI. Y. VaskoF. S. MozerS. D. BaleA. V. ArtemyevJ. W. BonnellR. ErgunB. GilesP.-A. LindqvistC. T. RussellR. Strangeway
刊名: The Astrophysical Journal Letters, 2020, Vol.889 (1)
来源数据库: Institute of Physics Journal
DOI: 10.3847/2041-8213/ab6582
原始语种摘要: We present analysis of more than 100 large-amplitude bipolar electrostatic structures in a quasi-perpendicular supercritical Earth's bow shock crossing, measured by the Magnetospheric Multiscale spacecraft. The occurrence of the bipolar structures is shown to be tightly correlated with magnetic field gradients in the shock transition region. The bipolar structures have negative electrostatic potentials and spatial scales of a few Debye lengths. The bipolar structures propagate highly oblique to the shock normal with velocities (in the plasma rest frame of the order of the ion-acoustic velocity. We argue that the bipolar structures are ion phase space holes produced by the two-stream instability between incoming and reflected ions. This is the first identification of the ion two-stream...
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  • scale 度盘
  • electrostatic 静电的
  • bipolar 二极的
  • tightly 紧密地
  • supercritical 超临界的
  • transition 转移
  • measured 量过的
  • reflected 反射
  • perpendicular 正交的
  • incoming 引入的