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arXiv 2008.00069astro-ph.SR
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太阳大气中离子间的速度漂移

On the velocity drift between ions in the solar atmosphere

Juan Martínez-Sykora, Mikolaj Szydlarski, Viggo H. Hansteen, Bart De Pontieu

摘要:

太阳大气是由许多处于不同电离和激发水平的物质组成的。上色球层、过渡区和日冕几乎没有碰撞。因此,例如,离子和中性粒子之间的滑移,或不同物种之间的相互作用,可能会发挥重要作用。我们已经开发了一个三维多流体和多物种的数值代码(Ebysus)来研究这种影响。Ebysus能够治疗物种(例如,氢、氦等)和流体(中性粒子、激发态和电离态元素),包括太阳大气中的非平衡电离、动量交换、辐射、热传导和其他复杂过程。将不同的物质视为不同的流体会导致不同离子之间的漂移以及耦合这些运动的电场。两种电离流体的耦合可以导致它们之间的反相旋转运动。不同的电离物质和动量交换可以消除这种速度漂移,即,将波浪动能转换成热能。高频阿尔文波驱动,例如,重联被认为发生在太阳大气中,可以驱动这种多离子速度漂移。

英文摘要:

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.

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