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arXiv physics/0411235physics.plasm-phphysics.geo-ph
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等离子体流中声波和回旋波的线性耦合

On linear coupling of acoustic and cyclotron waves in plasma flows

Andria Rogava, Grigol Gogoberidze

摘要:

研究发现,在磁化的静电等离子体流中,速度剪切耦合离子声波和离子回旋波,并导致在有利的条件下,它们的有效的相互转换。结果表明,在二维的设置,这种耦合有一个显着的功能:它是由方程,完全类似于那些描述的耦合声波与内部重力波[Rogava和Mahajan:物理学评论E卷55,1185(1997)]在中性流体流动。使用另一个值得注意的量子力学类比,我们计算转换系数,并给出充分的分析,定量描述的耦合效率低剪切速率的流动。

英文摘要:

It is found that in magnetized electrostatic plasma flows the velocity shear couples ion-acoustic waves with ion-cyclotron waves and leads, under favorable conditions, to their efficient reciprocal transformations. It is shown that in a two-dimensional setup this coupling has a remarkable feature: it is governed by equations that are exactly similar to the ones describing coupling of sound waves with internal gravity waves [Rogava & Mahajan: Phys. Rev. E vol.55, 1185 (1997)] in neutral fluid flows. Using another noteworthy quantum mechanical analogy we calculate transformation coefficients and give fully analytic, quantitative description of the coupling efficiency for flows with low shearing rates.

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