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Alfvenic fluctuations in the solar wind: nonlinearities and pressure anisotropy effects

机译：太阳风中的烤肉波动：非线性和压力各向异性效应

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摘要

Large amplitude, turbulent Alfvenic fluctuations have been commonly observed in the solar wind since the first in situ measurements. An important but still unexplained property of such nonlinear fluctuations seen typically in the fastest streams is that, despite the large excursion of the magnetic field fluctuations, the magnitude of the total magnetic field remains nearly constant, a condition that corresponds to spherical polarization. How is this Alfvenic turbulent state achieved in the solar wind remains a fundamental open question in space physics. Although nonlinear Alfvenic fluctuations have been studied for several decades, most of previous work has considered a plasma in thermodynamic equilibrium. The solar wind however displays many non-thermal features and here we discuss how non-thermal effects, in particular pressure anisotropy, and nonlinearities affect the stability and nonlinear evolution of Alfvenic fluctuations with constant total magnetic field magnitude in different plasma-beta regimes.
机译：由于第一次原位测量，在太阳风中通常观察到大振幅，湍流的烤盘波动。通常在最快的流中看到这种非线性波动的重要但仍然是未解释的性质，尽管磁场波动的大偏移，但总磁场的大小仍然几乎是恒定的，这是对应于球形偏振的条件。在太阳风中实现的这种烤肉湍流状态如何仍然是空间物理学的基本开放问题。虽然已经研究了几十年的非线性烤盘，但之前的大部分工作都认为热力学平衡的等离子体。然而，太阳风在这里显示许多非热特征，我们讨论了如何影响非热效应，特别是压力各向异性和非线性影响持续总磁场幅度在不同等离子体β制度中的恒定总磁场幅度的稳定性和非线性演变。

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