在极光Farley-Buneman turbulence中模式耦合和非线性朗道阻尼效应
Mode-coupling and nonlinear Landau damping effects in auroral Farley-Buneman turbulence
摘要:
极光区$E$中Farley-Buneman湍流的基本问题在过去的二十年中一直被广泛讨论和争论。在本论文中,我们打算澄清的不同步骤,极光$E$区域等离子体必须经过达到稳定状态之前。模式耦合计算,为Farley-Buneman湍流,是为了把它的角度,并估计其大小相对于所产生的异常效应,通过非线性波粒子相互作用。这种非线性效应,被称为非线性“朗道阻尼”,是由于波的耦合产生了其他波,这些波又通过朗道阻尼将能量损失给了大量的粒子。这导致波能量的衰减,并因此导致等离子体的加热。导出了场谱演化的方程,并对方程中的每一项给出了物理解释。
英文摘要:
The fundamental problem of Farley-Buneman turbulence in the auroral $E$-region has been discussed and debated extensively in the past two decades. In the present paper we intend to clarify the different steps that the auroral $E$-region plasma has to undergo before reaching a steady state. The mode-coupling calculation, for Farley-Buneman turbulence, is developed in order to place it in perspective and to estimate its magnitude relative to the anomalous effects which arise through the nonlinear wave-particle interaction. This nonlinear effect, known as nonlinear ``Landau damping'' is due to the coupling of waves which produces other waves which in turn lose energy to the bulk of the particles by Landau damping. This leads to a decay of the wave energy and consequently a heating of the plasma. An equation governing the evolution of the field spectrum is derived and a physical interpration for each of its terms is provided.
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