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Can the downward current region of the aurora be simulated in the laboratory?

机译：可以在实验室中模拟极光的向下电流区域吗？

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摘要

A laboratory plasma device is proposed to simulate the downward current region of the aurora. In this device, a discharge in neon is used as a plasma source to represent the hot plasma of the magnetosphere, and a sodium Q-machine source represents the ionospheric plasma. An electrostatic Vlasov model is used to simulate both the downward current region itself and the proposed laboratory analogue. All important phenomena that appear in the simulation of space are found in the laboratory simulation too: a double layer carries most of the potential difference; double layers are in constant motion in the direction of decreasing magnetic field; electron phase space holes appear on the high potential side of double layers and these holes carry a part of the potential difference during double layer disruptions. The ability to simulate auroral physics in the laboratory is better for the downward than the upward current region, because of the lower levels of ion acoustic-like waves in the laboratory model of the former region. Better laboratory-space agreement is found when the discharge and Q-machine ions are of similar masses. If the masses differ significantly, as they do when using helium together with sodium ions, waves on the ion time scale dominate the plasma on the low potential side of the double layer, and there is a tendency toward multiple double layers appearing simultaneously at different locations. The experiment is suitable for the study of heating processes that occur in the downward current region and to address the behaviour of the current-voltage relationship for low voltages.
机译：提出了一种实验室等离子体设备来模拟极光的向下电流区域。在该装置中，氖气放电被用作代表磁层热等离子体的等离子体源，而钠Q机源则代表电离层等离子体。静电Vlasov模型用于模拟向下电流区域本身和拟议的实验室模拟物。在空间模拟中出现的所有重要现象也可以在实验室模拟中找到：双层带有大部分电势差;双层在磁场减小的方向上恒定运动;电子相空间空穴出现在双层的高电势侧，在双层破坏期间，这些空穴带有一部分电势差。由于前一个区域的实验室模型中的离子声波水平较低，因此在实验室中模拟向下极光物理的能力要好于向上的当前区域。当放电离子和Q机器离子的质量相似时，可以发现更好的实验室空间一致性。如果质量显着不同（如与氦气和钠离子一起使用时的情况），则离子时标上的波将控制双层低电势侧的等离子体，并且存在在不同位置同时出现多个双层的趋势。该实验适合于研究在向下电流区域中发生的加热过程，并解决低电压下电流-电压关系的行为。

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