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首页> 外文期刊>Planetary and space science >Flushing effect in reconnection: Effects of minority species of oxygen ions
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Flushing effect in reconnection: Effects of minority species of oxygen ions

机译：重新连接中的冲洗效果：少数氧离子的影响

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摘要

Effects of O~+ ions on magnetic reconnection in the magnetotail are examined in a Harris equilibrium using a combination of linear Vlasov theory and large-scale driven and non-driven two-dimensional fully kinetic particle simulations. Linear theory of multiple species plasma indicates that the growth rate is rather insensitive to the composition of the background (lobe) or its temperature but more sensitive to the properties of the current carriers. Thus O~+ can affect significant changes to the linear growth rate of tearing mode only as a current carrier. However, it is demonstrated that in the nonlinear stage reconnection can effectively move trace material from the lobes into the current sheet proper. If the supply of lobe markers (like O~+) is sufficiently permanent in the lobe, an initially proton-dominated current sheet can be virtually replaced by the marker ions through this "flushing effect". The dominance of marker ions introduces finite Larmor radius signatures with marker gyroradii scales rather than that of the protons. In this way, the presence of heavier marker species in the lobe can lead to (i) reduced efficiency of energy conversion, (ii) reduction in the number and repetition frequency of secondary islands, (iii) broadening of the quadrupole magnetic structure, (iv) slowing down of the coalescence process and (v) modification of the composition of the ion current carriers. Using Cluster observations, we show the evidence for the "flushing effect" in the data. Detailed comparison with observations is planned for future work.
机译：结合线性弗拉索夫理论和大规模驱动和非驱动二维全动力学粒子模拟，在哈里斯平衡中研究了O〜+离子对磁尾磁重连接的影响。多物种血浆的线性理论表明，生长速率对背景（波瓣）的组成或其温度不敏感，但对当前载流子的特性更敏感。因此，O〜+仅作为电流载体可以影响撕裂模式线性增长率的显着变化。但是，事实证明，在非线性阶段，重新连接可以有效地将痕量材料从波瓣移到当前的工作层中。如果波瓣标记物（例如O〜+）的供应在波瓣中足够持久，则通过这种“冲洗作用”，最初由质子为主的电流片实际上可以被标记物离子代替。标记离子的优势引入了具有标记陀螺半径标度而不是质子的有限拉莫尔半径特征。这样，在波瓣中存在较重的标记物质会导致（i）能量转换效率降低；（ii）次级岛的数量和重复频率降低；（iii）四极磁性结构变宽；（ iv）减慢聚结过程，和（v）改变离子电流载体的组成。使用聚类观察，我们显示了数据中“潮红效应”的证据。计划与观察结果进行详细比较，以供将来的工作。

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