The cosmic rays non-resonant streaming instability is believed to be the source of substantial magnetic field amplification. In this work we investigate the effects of the ambient plasma temperature on the instability and derive analytical expressions of its growth rate in the hot, demagnetized regime of interaction. To study its non-linear evolution we perform hybrid-PIC simulations for a wide range of temperatures. We find that in the cold limit about two-thirds of the cosmic rays drift kinetic energy is converted into magnetic energy. Increasing the temperature of the ambient plasma can substantially reduce the growth rate and the magnitude of the saturated magnetic field.

中文翻译：

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关于热改性非共振流动不稳定性的增长

宇宙射线非共振流动不稳定性被认为是大量磁场放大的来源。在这项工作中，我们研究了环境等离子体温度对不稳定性的影响，并推导出了其在热、退磁相互作用机制中的增长率的解析表达式。为了研究它的非线性演变，我们在很宽的温度范围内进行了混合 PIC 模拟。我们发现在冷极限，大约三分之二的宇宙线漂移动能转化为磁能。增加周围等离子体的温度可以显着降低饱和磁场的生长速率和幅度。