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Toward a general quasi-linear approach for the instabilities of bi-Kappa plasmas. Whistler instability

机译:朝着一般的准线性方法,用于双κA等离子体的稳定性。 吹口哨不稳定

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Kappa distributions are ubiquitous in space and astrophysical poorly collisional plasmas, such as the solar wind, suggesting that microscopic and macroscopic properties of these non-equilibrium plasmas are highly conditioned by the wave-particle interactions. The present work addresses the evolution of anisotropic bi-Kappa (or bi-kappa-)distributions of electrons triggering instabilities of electromagnetic electron-cyclotron (or whistler) modes. The new quasi-linear approach proposed here includes time variations of the kappa parameter during the relaxation of temperature anisotropy. Numerical results show that kappa may increase for short interval of times at the beginning, but then decreases toward a value lower than the initial one, while the plasma beta and temperature anisotropy indicate a systematic relaxation. Our results suggest that the electromagnetic turbulence plays an important role on the suprathermalization of the plasma, ultimately lowering the parameter kappa. Even though the variation of kappa is in general negative (Delta kappa<0) this variation seems to depend of the initial conditions of anisotropic electrons, which can vary very much in the inner heliosphere.
机译:Kappa分布在空间和天体物理性质较差的碰撞等离子体(如太阳风)中普遍存在,这表明这些非平衡等离子体的微观和宏观性质受到波粒相互作用的高度制约。本文研究了电子各向异性bi-Kappa(或bi-Kappa-)分布对电磁电子回旋(或哨声)模不稳定性的影响。本文提出的新拟线性方法包括温度各向异性松弛过程中kappa参数的时间变化。数值结果表明,kappa在开始时可能会在短时间间隔内增加,但随后会朝着低于初始值的方向降低,而等离子体β和温度各向异性表明存在系统性弛豫。我们的结果表明,电磁湍流对等离子体的超热化起着重要作用,最终降低了参数kappa。尽管kappa的变化通常为负值(δkappa<0),但这种变化似乎取决于各向异性电子的初始条件,而在内日光层中,各向异性电子的初始条件变化很大。

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