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arXiv 2302.00147astro-ph.SR
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太阳大气中小尺度双流体喷流演化中磁场拓扑的影响

Influence of the magnetic field topology in the evolution of small-scale two-fluid jets in the solar atmosphere

E. E. Díaz-Figueroa, G. Ares de Parga, J. J. González-Avilés

摘要:

我们进行了一系列的数值模拟,重新创建小规模的两种流体射流使用JOANNA代码,考虑磁流体力学的两种流体(离子+电子和中性粒子)。我们首先激发射流在一个均匀的磁场通过使用速度脉冲扰动位于$y_{0}=$ 1.3,1.5,和1.8毫米,考虑在$y=0$ Mm光球的基础。然后,我们重复的激励射流在一个磁场,模仿通量管。主要是,在上色球层($y\sim1.8$ Mm)激发的喷流到达的高度低于在下色球层($y\sim1.3$ Mm)激发的喷流;这是由于等离子体拖曳量较少,初始垂直位置较高。在这两种情况下,中性粒子和离子的动力学表现出类似的行为,但是,我们仍然可以确定一些差异的速度漂移,这在我们的模拟是$10^{-3}$ km s $^{-1}$的顺序,一旦他们达到最大高度的射流的尖端。此外,我们估计由于离子和中性粒子($Q^{in}_{i,n}$)之间的摩擦产生的热量,这是$0.002-0.06$ W m $^{-3}$的顺序,但它是小的太阳日冕周围的加热作出贡献。在两个磁场环境中的喷流没有显示出实质性的差异,除了在达到的最大高度上的轻微变化之外,特别是在均匀磁场的情况下。最后,由三种不同的射流达到的最大高度是在对应于macrosepicules,I型骨针,和II型骨针的一些形态参数的范围内。

英文摘要:

We perform a series of numerical simulations to recreate small-scale two-fluid jets using the JOANNA code, considering the magnetohydrodynamics of two fluids (ions + electrons and neutral particles). We first excite the jets in a uniform magnetic field by using velocity pulse perturbations located at $y_{0}=$1.3, 1.5, and 1.8 Mm, considering the base of the photosphere at $y=0$ Mm. Then, we repeat the excitation of the jets in a magnetic field that mimics a flux tube. Mainly, the jets excited at the upper chromosphere ($y\sim1.8$ Mm) reach lower heights than those excited at the lower chromosphere ($y\sim1.3$ Mm); this is due to the higher initial vertical location because of the lesser amount of plasma dragging. In both scenarios, the dynamics of the neutral particles and ions show similar behavior; however, we can still identify some differences in the velocity drift, which in our simulations is of the order of $10^{-3}$ km s$^{-1}$ at the tips of the jets once they reached their maximum heights. Also, we estimate the heat generation due to the friction between ions and neutrals ($Q^{in}_{i,n}$), which is of the order of $0.002-0.06$ W m$^{-3}$; however it is small to contribute to the heating of the surroundings of the solar corona. The jets in the two magnetic environments do not show substantial differences other than a slight variation in the maximum heights reached, particularly in the uniform magnetic field scenario. Finally, the maximum heights reached by the three different jets are in the range of some morphological parameters corresponding to macrospicules, Type I spicules, and Type II spicules.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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