论文标题
动力学等离子体波对离子与电子质量比和降低速度比的依赖性
Dependence of kinetic plasma waves on ion-to-electron mass ratio and light-to-Alfvén speed ratio
论文作者
论文摘要
磁化$ |ω_ {\ mathrm e} |/ω_ {\ Mathrm {e}} $是血浆天体物理学中的重要参数，其中$ω_ {\ mathrm e} $和$ω__________________________{\ mathrm {e}} $ electer electer electer electer electry gyro-fre gyro-free gyro-free gyro-free gyro-free gyro-free gy yro-free gyyro-fre re recy clyro-free gy yro-free。它仅取决于质量比$ m _ {\ mathrm i}/m _ {\ mathrm e} $和灯与降速比率$ c/v _ {\ mathrm {ai}} $ $ c $是光的速度，$ v _ {\ mathrm {ai}} $是离子alfvén速度。非线性数值等离子体模型（例如粒子中模拟）通常必须假设$ M _ {\ Mathrm I}/M _ {\ Mathrm E} $的不现实值，以及$ C/V _ {\ Mathrm {ai}} $。因为线性理论在小幅度下为波浪性能的参数量表产生了精确的结果，所以我们使用线性理论来研究alfvén/ion-cyclotron和fast-magnetosonic/whistler波的分散关系，作为基于$ m _ {\ mathrm i}/m _ _}的典型示例作为集体等离子体行为的主要示例$ c/v _ {\ mathrm {ai}} $。我们分析他们对$ M _ {\ Mathrm I}/M _ {\ Mathrm E} $和$ C/V _ {\ Mathrm {ai}} $的$ c/v _ {\ Mathrm {ai}} $在Quasi-Parallel和quasi-Penticular and Quasi-Pendicular方向上的繁殖方向与$β_J$ $β_J\ sim $β_J\ sim partiore的繁殖方向物种$ j $的磁性压力。尽管它们的分散关系在很大程度上独立于$ c/v _ {\ mathrm {ai}} $，for $ c/v _ {\ mathrm {\ mathrm {ai}} \ gtrsim 10 $，质量比$ $ m _ {\ mathrm i}/m _}/m _ {此外，我们研究了相对论电子对分散关系的影响。根据我们的结果，我们建议您的目标更现实的价值为$ m _ {\ mathrm i}/m _ {\ mathrm e} $，而不是$ c/v _ {\ mathrm {ai}} $的更现实的价值在非占用的等离子模拟的情况下，尽管$ \ \ \ d dots
The magnetization $|Ω_{\mathrm e}|/ω_{\mathrm{e}}$ is an important parameter in plasma astrophysics, where $Ω_{\mathrm e}$ and $ω_{\mathrm{e}}$ are the electron gyro-frequency and electron plasma frequency, respectively. It only depends on the mass ratio $m_{\mathrm i}/m_{\mathrm e}$ and the light-to-Alfvén speed ratio $c/v_{\mathrm{Ai}}$, where $m_{\mathrm i}$ ($m_{\mathrm e}$) is the ion (electron) mass, $c$ is the speed of light, and $v_{\mathrm{Ai}}$ is the ion Alfvén speed. Nonlinear numerical plasma models such as particle-in-cell simulations must often assume unrealistic values for $m_{\mathrm i}/m_{\mathrm e}$ and for $c/v_{\mathrm{Ai}}$. Because linear theory yields exact results for parametric scalings of wave properties at small amplitudes, we use linear theory to investigate the dispersion relations of Alfvén/ion-cyclotron and fast-magnetosonic/whistler waves as prime examples for collective plasma behaviour depending on $m_{\mathrm i}/m_{\mathrm e}$ and $c/v_{\mathrm{Ai}}$. We analyse their dependence on $m_{\mathrm i}/m_{\mathrm e}$ and $c/v_{\mathrm{Ai}}$ in quasi-parallel and quasi-perpendicular directions of propagation with respect to the background magnetic field for a plasma with $β_j\sim1$, where $β_j$ is the ratio of the thermal to magnetic pressure for species $j$. Although their dispersion relations are largely independent of $c/v_{\mathrm{Ai}}$ for $c/v_{\mathrm{Ai}}\gtrsim 10$, the mass ratio $m_{\mathrm i}/m_{\mathrm e}$ has a strong effect at scales smaller than the ion inertial length. Moreover, we study the impact of relativistic electron effects on the dispersion relations. Based on our results, we recommend aiming for a more realistic value of $m_{\mathrm i}/m_{\mathrm e}$ than for a more realistic value of $c/v_{\mathrm{Ai}}$ in non-relativistic plasma simulations if such a choice is necessary, although $\dots$
