Heat transport in the solar wind is dominated by suprathermal electron populations, i.e., a tenuous halo and a field-aligned beam/strahl, with high energies and antisunward drifts along the magnetic field. Their evolution may offer plausible explanations for the rapid decrease of the heat flux with the solar wind expansion, and self-generated instabilities, or so-called “heat flux instabilities” (HFIs), are typically invoked to explain this evolution. This Letter provides a unified description of the full spectrum of HFIs, as prescribed by the linear kinetic theory for high beta conditions ( β e ≫ 0.1) and different relative drifts ( U ) of the suprathermals. HFIs of different natures are examined, i.e., electromagnetic, electrostatic or hybrid, propagating parallel or obliquely to the magnetic field, etc., as well as their regimes of interplay (co-existence) or dominance. These alternative regimes of HFIs complement each other and may be character...

中文翻译：

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太阳风中电子热通量不稳定性的替代性高等离子Beta制度

太阳风中的热传输主要由超热电子种群控制，即，一个微弱的光晕和一个与磁场对准的束/杂散层，它们具有高能量，并且沿着磁场会产生逆向漂移。它们的演变可能为随着太阳风的膨胀而导致的热通量的快速下降提供了合理的解释，通常会引用自生不稳定性或所谓的“热通量不稳定性”（HFI）来解释这种演变。这封信提供了有关线性热力学理论的HFI全谱的统一描述，线性动力学理论针对高β条件（βe≫ 0.1）和超热体的不同相对漂移（U）进行了规定。检查了不同性质的HFI，即电磁，静电或混合HFI，它们平行于或倾斜于磁场传播，等等，以及它们之间的相互作用（共存）或主导地位。HFI的这些替代制度互为补充，可能具有特色...