SIMULATION STUDIES OF ACCELERATION OF HEAVY IONS AND THEIR ELEMENTAL COMPOSITIONS
SIMULATION STUDIES OF ACCELERATION OF HEAVY IONS AND THEIR ELEMENTAL COMPOSITIONS
复制标题
重离子加速及其元素组成的模拟研究
DOI：
10.1023/a:1004950910704
复制
发表时间：
1996
期刊：
影响因子：
2.8
通讯作者：
Y. Ohsawa
中科院分区：
文献类型：
--
作者：
M. Toida;Y. Ohsawa
利用一维（一个空间坐标和三个速度分量）电磁粒子模拟程序，研究了多离子种类等离子体中非线性磁声波对重离子的加速.首先，我们描述了磁声波加速重离子的机制。然后我们通过粒子模拟来研究这一点。模拟等离子体包含四种离子种类：H、He、O和Fe。He的数密度取H的10%，O和Fe的数密度要低得多。模拟证实，与单离子物种等离子体一样，波中形成的纵向电场可以加速一些氢。此外，他们表明磁声波可以通过不同的机制加速所有重物质（He，O和Fe）的所有粒子，即，横向电场的影响重物质的最大速度大致相同，与波的传播速度相同。这与理论预测是一致的。这些结果表明，如果通过这些机制在日冕中产生高能离子，则这些重离子的元素组成可以与背景等离子体的元素组成相似，即，电晕。
By using a one-dimension (one spatial coordinate and three-velocity components), electromagnetic particle simulation code with full ion and electron dynamics, we have studied the acceleration of heavy ions by a nonlinear magnetosonic wave in a multi-ion-species plasma. First, we describe the mechanism of heavy ion acceleration by magnetosonic waves. We then investigate this by particle simulations. The simulation plasma contains four ion species: H, He, O, and Fe. The number density of He is taken to be 10% of that of H, and those of O and Fe are much lower. Simulations confirm that, as in a single-ion-species plasma, some of the hydrogen can be accelerated by the longitudinal electric field formed in the wave. Furthermore, they show that magnetosonic waves can accelerate all the particles of all the heavy species (He, O, and Fe) by a different mechanism, i.e., by the transverse electric field. The maximum speeds of the heavy species are about the same, of the order of the wave propagation speed. These are in good agreement with theoretical prediction. These results indicate that, if high-energy ions are produced in the solar corona through these mechanisms, the elemental compositions of these heavy ions can be similar to that of the background plasma, i.e., the corona.