阿尔文龙卷风
Alfvenic tornadoes
摘要：
结果表明，三维修正动力学阿尔文波（m-KAWs）可以以等离子体密度涡或携带轨道角动量（OAM）的磁通绳为特征的阿尔文龙卷风的形式传播.利用双流体模型和安培定律，导出了具有$m_e/m_i \ll β\ll 1$的磁等离子体中三维m-KAWs的波动方程，其中$m_e$ $(m_i)$为电子（离子）质量，$β=4 πn_0 k_B (T_e + T_i)/B_0^2$，$n_0$为未扰动等离子体数密度，$k_B$为玻耳兹曼常量，$T_e (T_e)$为电子（离子）温度，$B_0$为环境磁场强度. 3D m-KAW方程允许以拉盖尔-高斯（LG）阿尔文涡旋束或阿尔文龙卷风的形式的解，其具有支持阿尔文磁通量绳的动力学的等离子体密度旋转。
英文摘要：
It is shown that a three-dimensional (3D) modified-kinetic Alfvén waves (m-KAWs) can propagate in the form of Alfvénic tornadoes characterized by plasma density whirls or magnetic flux ropes carrying orbital angular momentum (OAM). By using the two fluid model, together with Ampère's law, we derive the wave equation for a 3D m-KAWs in a magnetoplasma with $m_e/m_i \ll β\ll 1$, where $m_e$ $(m_i)$ is the electron (ion) mass, $β=4 πn_0 k_B (T_e + T_i)/B_0^2$, $n_0$ the unperturbed plasma number density, $k_B$ the Boltzmann constant, $T_e (T_e)$ the electron (ion) temperature, and $B_0$ the strength of the ambient magnetic field. The 3D m-KAW equation admits solutions in the form of a Laguerre-Gauss (LG) Alfvénic vortex beam or Alfvénic tornadoes with plasma density whirls that support the dynamics of Alfvén magnetic flux ropes.
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