Evolution of diamagnetic cavities in the solar wind
Evolution of diamagnetic cavities in the solar wind
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DOI：
10.1029/ja093ia10p11341
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发表时间：
1988-10
影响因子：
--
通讯作者：
V. Thomas;S. Brecht
中科院分区：
文献类型：
--
作者：
V. Thomas;S. Brecht
考虑了有限等离子体束通过平行于环境磁场的无碰撞等离子体的二维混合(粒子离子和流体电子)模拟。当相对漂移速度超过局部Alfven速度的两倍时，激发了电磁离子束不稳定性，在与β相互作用的区域产生了大于1的高能等离子体。这种高能的等离子体推出磁场，形成一个抗磁空穴，并发射出阿尔芬波。讨论了这一结果在最近太阳风中热反磁腔观测中的应用。
Two-dimensional hybrid (particle ions and fluid electrons) simulations of a finite plasma beam moving through a collisionless plasma parallel to an ambient magnetic field are considered. When the relative drift speed exceeds twice the local Alfven velocity, an electromagnetic ion beam instability is excited which produces an energetic plasma in the interaction region with β larger than unity. This energetic plasma pushes out the magnetic field, creating a diamagnetic cavity and launching outgoing Alfven waves. Application of the results to recent observations of hot diamagnetic cavities in the solar wind is discussed.