论文标题
混乱诱导的电阻率在不同的磁性构型中
Chaos-induced resistivity in different magnetic configurations
论文作者
论文摘要
人们普遍认为，磁重新连接在空间和天体物理等离子体的各种喷发现象中起重要作用。但是，异常电阻率的机制一直是一个开放且未解决的问题。吉田（1998）提出的混乱诱导的电阻率是异常电阻率的可能机制之一。通过使用测试粒子模拟，本工作研究了混乱诱导的电阻率，用于重新连接磁场的不同配置及其在重新连接电流板的不同混乱区域中的分布。结果表明，混乱诱导的电阻率的数量级可能比X型混乱区域的经典spitzer电阻率高6-7个数量级，而在O型混沌区域中，混乱的电阻率可以比5个数量级。此外，在X型混沌区域中，磁化情况的混乱诱导的电阻率高2至3倍，而不是未磁性的情况，但是在O-Type混乱区域中，ChAOS诱导的磁化案例的电阻率接近或较低的情况接近或较低。目前的工作有助于理解重新连接电流表的动态，尤其是对无碰撞重新连接区域异常电阻率的发电机理的理解。
It is widely believed that magnetic reconnection plays an important role in various eruptive phenomena of space and astrophysical plasmas. The mechanism of anomalous resistivity, however, has been an open and unsolved problem. The chaos-induced resistivity proposed by Yoshida (1998) is one of possible mechanisms for anomalous resistivity. By use of the test particle simulation, the present work studies the chaos-induced resistivity for different configurations of reconnection magnetic fields and its distribution in different chaos regions of reconnection current sheets. The results show that the chaos-induced resistivity can be 6-7 orders of magnitude higher than the classical Spitzer resistivity in the X-type chaos regions and 5 orders of magnitude in the O-type chaos regions. Moreover, in the X-type chaos regions the chaos-induced resistivity of the magnetized case is higher by a factor of 2 to 3 times than that of the unmagnetized case, but in the O-type chaos regions the chaos-induced resistivity of the magnetized case is close to or lower than that of the unmagnetized case. The present work is helpful to the understanding of the dynamics of reconnection current sheets, especially of the generation mechanism of the anomalous resistivity of collisionless reconnection regions.
