霍尔效应引起的微磁层的东西不对称性
West-east asymmetry of a mini-magnetosphere induced by Hall effects
摘要：
一个大小与离子惯性长度相当的磁层，被称为微型磁层，具有不寻常的特征，这些特征已经被数值模拟预测并在最近的实验中显示出来。在本论文中，我们研究了一个显着的差异，西翼和东翼的一个小型磁层首次观察到的开拓性的terrella实验的60 s的持续时间。它表现在等离子体渗透到西翼深处，并形成影响磁结构的返回电流，而东翼则具有明确的边界层和等离子体空腔。我们建议，等离子体穿透和返回电流可以理解的测试粒子模型的框架。这个模型可以简单地说明霍尔物理学，我们在以前的实验中观察到的微型磁层的前部和尾部发现了类似的特征。由于大的回旋半径，离子倾向于被东侧的偶极场偏转并被拉入西侧。为了验证磁层等离子体中的返回电流是由离子携带的，我们用Rogovski线圈直接测量了它，并与朗缪尔探针测量的离子通量进行了比较。
英文摘要：
A magnetosphere comparable in size to ion inertial length, known as a mini-magnetosphere, possesses unusual features which have been predicted by numerical simulations and shown in recent experiments. In the present paper we study a pronounced difference between the west and east flanks of a mini-magnetosphere observed for the first time in pioneering terrella experiments of 60 s duration. It manifests itself in plasma penetration deep inside the west flank and the formation of a return current that effects the magnetic structure, in contrast to the east flank which has a well-defined boundary layer and plasma cavity. We propose that the plasma penetration and the return current can be understood in the framework of a test-particle model. This model serves to illustrate in simple terms the Hall physics which was found to be behind similar features at the frontal part and the tail of the mini-magnetosphere observed in our previous experiments. Because of the large gyroradius, ions tend to be deflected by the dipole field at the east flank and drawn into the west flank. To verify that the return electric current in the magnetospheric plasma is carried by ions, we measured it directly using a Rogovski coil and compared it with the ion flux measured by Langmuir probe.
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