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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Simulations of plasma obeying Coulomb's law and the formation of suprathermal ion tails in the solar wind
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Simulations of plasma obeying Coulomb's law and the formation of suprathermal ion tails in the solar wind

机译：等离子体遵循库仑定律和太阳风中超热离子尾部形成的模拟

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摘要

We present a model for the velocity distribution function (VDF) of the suprathermal ion tail in the solar wind and its commonly observed spectrum, a power law in velocity of index ?5. The mechanism for our model is acceleration from extremely small scale electric fields caused by the finite number of particles in the solar wind (or any plasma). The simulations produce a VDF with a broken power law at short times and a type of κ distribution VDF at later times. The simulation uses very few assumptions as it is based solely on Coulomb's law, and the results are robust to a range of parameters that, although outside the range of the solar wind at 1 AU, are close to those in the lower solar atmosphere. Furthermore, we provide predictions based on the following mechanism: the probability distribution function for the electric field (the electric field distribution function or EDF) dictates the final state of the plasma, which means that the VDF at any time is a convolution of the initial VDF and the EDF. We have also shown that by varying the power law index of the electrostatic force law, the relationship between the two is such that the EDF power law index is exactly 5 for Coulomb's law, harder for shorter-range forces, and softer for longer-range forces, converging to a power law of index 3 in the former limit and to a Maxwellian in the latter.
机译：我们为太阳风中的超热离子尾部的速度分布函数（VDF）及其通常观察到的谱提供了一个模型，该模型的速度为指数？5。我们模型的机制是由太阳风（或任何等离子）中有限数量的粒子引起的极小规模电场加速。仿真产生的VDF在短时间内具有破坏的功率定律，而在后期则具有κ分布VDF。由于仅基于库仑定律，该模拟使用很少的假设，并且结果对一系列参数均具有鲁棒性，尽管该参数超出了1 AU的太阳风范围，但仍接近较低太阳大气层的参数。此外，我们基于以下机制提供了预测：电场的概率分布函数（电场分布函数或EDF）决定了等离子体的最终状态，这意味着VDF在任何时候都是初始的卷积VDF和EDF。我们还表明，通过改变静电力定律的幂定律指数，两者之间的关系使得EDF幂定律指数对于库仑定律正好为5，对于短程力更难，而对于长程力更弱。力，在前一个极限处收敛到指数为3的幂定律，在后一个极限处收敛为麦克斯韦式。

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