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Laboratory model of magnetosphere created by strong plasma perturbation with frozen-in magnetic field

机译：冻结磁场强等离子体摄动产生的磁层实验室模型

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Transient interactions of a magnetic dipole with plasma flow carrying a southward magnetic field has been studied in laboratory experiments. Flow with a transverse frozen-in field was generated by means of laser-produced plasma cross-field expansion into background plasma, which filled a vacuum chamber, along with the external application of a magnetic field prior to interaction. Probe measurements showed that at the plasma parameters realized, effective collisionless Larmor coupling takes place resulting in the formation of strong compressive perturbations, which propagate in the background with super-Alfvenic velocity and generate a frame-transverse electric field comparable in value to the expected induction one in the laboratory. Compression pulses with a southward field interact with a dipole and create a well-defined magnetosphere after a short propagation. Comparison of the magnetospheres created by laser-produced plasma expanding in a vacuum field and in a magnetized background revealed fundamental differences in the structure and behaviour of the electric potential in plasma. In the presence of a frozen-in southward field direct sub-solar penetration of outside electric potential deep inside of the magnetosphere was observed to take place, with a velocity close to the upstream Alfven speed.
机译：在实验室实验中已经研究了磁偶极子与携带向南磁场的等离子体流的瞬态相互作用。具有横向冻结场的流动是通过激光产生的等离子体交叉场扩展到背景等离子体中而产生的，该背景等离子体填充了真空室，并且在相互作用之前外部施加了磁场。探针测量表明，在实现的等离子体参数下，发生了有效的无碰撞拉莫尔耦合，从而形成了强烈的压缩扰动，这些扰动在背景中以超Alfvenic速度传播，并产生了与预期感应值相当的框架横向电场一个在实验室里。具有南场的压缩脉冲与偶极子相互作用，并在短暂传播后形成一个定义明确的磁层。比较由激光产生的等离子体在真空场和磁化背景中产生的磁层，揭示了等离子体中电势的结构和行为的根本差异。在存在冻结的南向磁场的情况下，观察到磁层内部深处的外部电势直接“潜入”了，渗透速度接近上游Alfven速度。

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