论文标题
在太阳大气中的离子之间的速度漂移
On the velocity drift between ions in the solar atmosphere
论文作者
论文摘要
太阳大气由许多在不同的电离和激发水平下填充的物种组成。上染色体,过渡区和电晕几乎无碰撞。因此,例如,离子和中性颗粒或单独物种之间的相互作用之间的滑倒可能起重要作用。我们已经开发了3D多流体和多物种数值代码(EBYSUS)来研究这种效果。 Ebysus能够分别处理物种(例如氢,氦气等)和流体(中性,激发和电离元素),包括非平衡电离,动量交换,辐射,热传导以及其他太阳能大气中的其他复杂过程。将不同的物种视为不同的流体会导致不同离子和伴随这些运动的电场之间的漂移。两种电离流体的耦合可以导致它们之间的反相旋转运动。不同的离子物种和动量交换可以消散这种速度漂移,即将波动能转化为热能。高频alfvén波由被认为是在太阳大气中发生的重新连接驱动的,可以驱动这种多离子速度漂移。
The solar atmosphere is composed of many species which are populated at different ionization and excitation levels. The upper chromosphere, transition region, and corona are nearly collisionless. Consequently, slippage between, for instance, ions and neutral particles, or interactions between separate species, may play important roles. We have developed a 3D multi-fluid and multi-species numerical code (Ebysus) to investigate such effects. Ebysus is capable of treating species (e.g., hydrogen, helium, etc) and fluids (neutrals, excited and ionized elements) separately, including non-equilibrium ionization, momentum exchange, radiation, thermal conduction, and other complex processes in the solar atmosphere. Treating different species as different fluids leads to drifts between different ions and an electric field that couples these motions. The coupling for two ionized fluids can lead to an anti-phase rotational motion between them. Different ionized species and momentum exchange can dissipate this velocity drift, i.e., convert wave kinetic energy into thermal energy. High frequency Alfvén waves driven by, e.g., reconnection thought to occur in the solar atmosphere, can drive such multi-ion velocity drifts.