Formation of double layers and electron holes in a current-driven space plasma.
Formation of double layers and electron holes in a current-driven space plasma.
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DOI：
10.1103/physrevlett.87.255001
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发表时间：
2001-11
影响因子：
8.6
通讯作者：
D. Newman;Martin V. Goldman;R. Ergun;André Mangeney
中科院分区：
文献类型：
--
作者：
D. Newman;Martin V. Goldman;R. Ergun;André Mangeney
动力学一维模拟表明，载流等离子体中的弱密度抑制可以导致强电势斜坡（双层）的形成。它产生的斜坡和等离子体湍流与极光电离层最近的粒子和场测量具有许多共同特征。由斜坡加速的电子束通过空间双流不稳定性产生一系列传播的电子相空间空穴。发现与这些空穴的形成和合并相关的电子加热会影响电势斜坡的后续演变。
Kinetic 1D simulations reveal that a weak density depression in a current-carrying plasma can lead to the formation of a strong potential ramp (double layer). The ramp and plasma turbulence it creates share many features with recent particle and field measurements in the auroral ionosphere. An electron beam accelerated by the ramp produces a series of propagating electron phase-space holes via a spatial two-stream instability. Electron heating associated with the formation and merging of these holes is found to influence the subsequent evolution of the potential ramp.