论文标题
在扩大的太阳风中，在存在核心和外部人群的情况下通过电子消防不稳定的无碰撞热通量调节
Collisionless heat flux regulation via electron firehose instability in presence of a core and suprathermal population in the expanding solar wind
论文作者
论文摘要
太阳风中电子热通量的演变受几种效果之间的相互作用的调节：太阳风膨胀，可能会驱动速度空间的稳定性，湍流和波浪粒子相互作用，以及可能的碰撞。在这里，我们解决了在有多个电子种群存在下发展的太阳风膨胀和电子消防不稳定性在调节热通量中发育的各自作用。我们进行了完全动力学的扩展框模型模拟，并分别分析了每种电子物种的焓，散装和速度分布函数偏度贡献。我们观察到，确定电子通量演化的关键因素是在太阳风的其余框架中降低电子种群的漂移速度。在我们的模拟中，观察到电子消防不稳定性开始后，电子热能从平行到垂直方向的重新分布。但是，此过程似乎仅对能量通量的演变仅最大程度地影响。因此，太阳风框中电子物种漂移速度的降低似乎与热通量不稳定性的效率直接相关
The evolution of the electron heat flux in the solar wind is regulated by the interplay between several effects: solar wind expansion, that can potentially drive velocity-space instabilties, turbulence and wave-particle interactions, and, possibly, collisions. Here we address the respective role played by the solar wind expansion and the electron firehose instability, developing in the presence of multiple electron populations, in regulating the heat flux. We carry out fully kinetic, Expanding Box Model simulations and separately analyze the enthalpy, bulk and velocity distribution function skewness contributions for each of the electron species. We observe that the key factor determining electron energy flux evolution is the reduction of the drift velocity of the electron populations in the rest frame of the solar wind. In our simulations, redistribution of the electron thermal energy from the parallel to the perpendicular direction after the onset of the electron firehose instability is observed. However, this process seems to impact energy flux evolution only minimally. Hence, reduction of the electron species drift velocity in the solar wind frame appears to directly correlate with efficiency for heat flux instabilities
