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以多级波粒相互作用模型和1维电磁混合模拟方法研究了高速太阳风中α粒子分布的形成机制.认为α粒子从其产生区到1AU,经历4个特征区域:在冕洞下方的小尺度磁重联区,α粒子产生并得到加速:在约十几个太阳半径日冕区,α粒子形成球壳分布函数:在几十个太阳半径处,在Alfven波和温度各向异性不稳定性的作用下,α粒子分布函数演化为漂移Maxwell分布:当α粒子进入0.3-1AU时,Alfven波的作用使α粒子速度超过太阳风速度约1个局域Alfven速度.
The formation mechanism of α particle distribution in high-speed solar wind was studied by using multi-stage wave-particle interaction model and 1-D electromagnetic hybrid simulation. The alpha particles are thought to undergo four characteristic regions from their region of production to four distinct regions: a small-scale magnetic reconnection region below the coronal holes, where alpha particles are generated and accelerated: alpha particles form spherical shells in about a dozen solar radius corona regions Distribution function: The alpha particle distribution function evolves as a drift Maxwell distribution at dozens of solar radii under the influence of Alfven wave and temperature anisotropy: when the alpha particle enters 0.3-1 AU, the Alfven wave The effect causes the alpha particle velocity to exceed the local Alfven velocity of the solar wind velocity by about 1.