Exact nonlinear analytic Vlasov-Maxwell tangential equilibria with arbitrary density and temperature profiles

A family of Vlasov-Maxwell equilibrium distribution functions describing a transition from the Harris sheet to the force-free Harris sheet

We discuss a family of Vlasov-Maxwell equilibrium distribution functions for current sheet equilibria that are intermediate cases between the Harris sheet and the force-free (or modified) Harris sheet. These equilibrium distribution functions have potential applications to space and astrophysical plasmas. The existence of these distribution function had been briefly discussed in by Harrison and Neukirch 2009, but here it is shown that their approach runs into problems in the limit where the guide field goes to zero. The nature of this problem will be discussed and an alternative approach will …

Kinetic models of tangential discontinuities in the solar wind

Kinetic-scale current sheets observed in the solar wind are frequently approximately force-free despite the fact that their plasma $β$ is of the order of one. In-situ measurements have recently shown that plasma density and temperature often vary across the current sheets, while the plasma pressure is approximately uniform. In many cases these density and temperature variations are asymmetric with respect to the center of the current sheet. To model these observations theoretically we develop in this paper equilibria of kinetic-scale force-free current sheets that have plasma density and tempe…

具有重离子的弱碰撞空间等离子体中的波-粒子平衡

Wave-particle equilibria with heavy ions in weakly collisional space plasmas

研究重离子与电磁波相互作用如何塑造速度分布函数，并影响电磁波色散关系。通过Boris算法模拟重离子运动，结合ALPS代码推导色散关系，揭示波-粒子平衡的稳态特性。

Kelvin-Helmholtz instability of the collisionless anisotropic space plasma

The linear MHD Kelvin-Helmholtz instability (KHI) in an anisotropic plasma concerning the direction of an external magnetic field is examined in detail. For this purpose, the MHD equations are used to describe the motion of plasma as a fluid, which is derived from 16 moments of Boltzmann-Vlasov kinetic equations for collisionless plasma. In addition, the heat flux along the magnetic field is taken into account. The growing rates of KHI are calculated as functions of the anisotropic plasma properties for a shear flow along the magnetic field at supersonic velocities. On the other hand, the quas…