太阳风中芯-斯特拉洛模型下各向异性与偏斜驱动的哨声波不稳定性的相互作用
Interplay Between Anisotropy- and Skewness-driven Whistler Instabilities in the Solar Wind under the Core-Strahlo model
AI总结：
本文通过线性动理学理论，采用芯-斯特拉洛模型研究太阳风中温度各向异性与场向偏斜共同驱动的哨声波不稳定性，发现超热斯特拉洛群体是更强的自由能源，且可忽略芯各向异性贡献。
摘要：
温度各向异性和场向偏斜是太阳风电子速度分布中常见的非热特征。这些特征可以作为自由能源来 destabilize 不同的电磁波模式，通过波粒相互作用可能改变等离子体状态。以往的理论研究主要集中于单独分析这些非热特征和自生不稳定性。然而，为了更准确和真实地理解太阳风中的动力学过程，有必要考察这两种能源之间的相互作用。通过线性动理学理论，本文研究了当电子群体同时表现出温度各向异性和场向斯特拉尔或偏斜时，平行传播的哨声波模式被 destabilize 的激发过程。为了描述太阳风电子，我们采用芯-斯特拉洛模型作为替代方法。该模型的优势在于，利用一个已知为斯特拉洛群体的单一偏斜-卡帕分布来表示晕和斯特拉尔电子的超热特征。我们的研究结果表明，当电子斯特拉洛表现出固有的温度各向异性时，该超热群体成为 destabilize 哨声波模式的更强且更有效的自由能源。这表明各向异性斯特拉洛在由波粒相互作用调节的过程中参与度更高。目前的结果还表明，在评估由超热群体驱动的不稳定性的重要性时，可以安全地忽略芯各向异性的贡献。这使得研究可以聚焦，特别是关于太阳风中电子热通量的调节。
英文摘要：
Temperature anisotropy and field-aligned skewness are commonly observed non-thermal features in electron velocity distributions in the solar wind. These characteristics can act as a source of free energy to destabilize different electromagnetic wave modes, which may alter the plasma state through wave-particle interactions. Previous theoretical studies have mainly focused on analyzing these non-thermal features and self-generated instabilities individually. However, to obtain a more accurate and realistic understanding of kinetic processes in the solar wind, it is necessary to examine the interplay between these two energy sources. By means of linear kinetic theory, in this paper we investigate the excitation of the parallel-propagating whistler mode, when it is destabilized by electron populations exhibiting both temperature anisotropy and field-aligned strahl or skewness. To describe the solar wind electrons, we adopt the Core-Strahlo model as an alternative approach. This model offers the advantage of representing the suprathermal features of halo and strahl electrons, using a single skew-Kappa distribution already known as the strahlo population. Our findings show that when the electron strahlo exhibits an intrinsic temperature anisotropy, this suprathermal population becomes a stronger and more efficient source of free energy for destabilizing the whistler mode. This suggests a greater involvement of the anisotropic strahlo in processes conditioned by wave-particle interactions. Present results also suggest that the contribution of core anisotropy can be safely disregarded when assessing the importance of instabilities driven by the suprathermal population. This allows for a focused study, particularly regarding the regulation of electron heat flux in the solar wind.
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