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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Experimental characterization of broadband electrostatic noise due to plasma compression
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Experimental characterization of broadband electrostatic noise due to plasma compression

机译：实验描述的宽带由于等离子体静电噪声压缩

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摘要

For a wide variety of laboratory and space plasma environments, theoretical predictions state that plasmas are unstable to inhomogeneous flows over a very broad frequency range. Such sheared flows are generated in the Earth’s magnetosphere and intensify during active periods. Specifically, for a velocity shear oriented perpendicular to a uniformbackgroundmagnetic field, the shear scale length (L_E) compared to the ion gyroradius (ρ_i) determines the character of the shear-driven instability that may prevail. An interpenetrating plasma configuration is used to create a transverse velocity shear profile in a magnetized plasma column, a condition similar to that found in the natural boundary layers. The continuous variation of ρ_i/L_E and the associated transition of the instability regimes driven by the shear flow mechanism are demonstrated in a single laboratory experiment. Broadband wave emission correlated to increasing/decreasing stress (i.e., ρ_i/L_E), a characteristic signature of a boundary layer crossing, is found under controlled and repeatable conditions. This result holds out the promise for understanding the cause and effect of the in situ observation of broadband electrostatic noise.
机译：各种各样的实验室和空间等离子体环境,理论预测状态等离子体不稳定非均匀流动一个很宽的频率范围。在地球的磁气圈和生成加强活跃的时期。一个垂直的速度剪切uniformbackgroundmagnetic场、剪切的规模长度(L_E)相比,离子回转半径(ρ_i)决定shear-driven的特点不稳定,可能获胜。等离子体用于创建一个配置横向剪切速度剖面磁化等离子体柱,类似发现在自然边界层。变异的ρ_i / L_E和相关联的不稳定的政权由过渡在一个演示了剪切流机制单一的实验室实验。增加/减少排放相关压力(例如,ρ_i / L_E),一个特点签名的边界层,控制和可重复的条件。结果带来了理解的承诺原位观察的因果关系宽带静电噪音。

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