太阳大气中氢的电离

IF 0.6 Q4 ASTRONOMY & ASTROPHYSICS
J. Chae
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引用次数: 1

摘要

氢的电离度在太阳色球层等离子体的物理学中是至关重要的。它特别限制了等离子体温度的范围,可以从Hα线确定。考虑到色球极大地偏离了局部热力学平衡(LTE)条件,氢电离的精确测定需要求解整个大气的一整套非LTE辐射传输方程,这通常是一项艰巨的任务。在许多情况下,仍然有必要获得氢电离的快速估计,而不必求解非lte辐射传输。在这里,我们提出一种简单的方法来满足这一需求。我们假设,即使局部物理条件发生变化,光电离辐射场也不会随时间变化。有了这个假设,光电离率可以从一个已发表的大气模型中得到,当温度和电子密度给定时,光电离率可以用来确定氢的电离程度。我们的方法的应用表明,在色球环境中,在低于17000 K的温度下,等离子体特征含有10%以上的中性氢,而在高于23000 K的温度下,则含有不到1%的中性氢,这意味着从Hα线测定的氢温度在低于20000 K时在物理上是合理的,但如果高于25000 K,则可能不真实。我们的结论是,我们的方法可以很容易地利用,以获得在太阳色球中等离子体特征氢电离的快速估计。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Ionization of Hydrogen in the Solar Atmosphere
The ionization degree of hydrogen is crucial in the physics of the plasma in the solar chromosphere. It specifically limits the range of plasma temperatures that can be determined from the Hα line. Given that the chromosphere greatly deviates from the local thermodynamic equilibrium (LTE) condition, precise determinations of hydrogen ionization require the solving of the full set of non-LTE radiative transfer equations throughout the atmosphere, which is usually a formidable task. In many cases, it is still necessary to obtain a quick estimate of hydrogen ionization without having to solve for the non-LTE radiative transfer. Here, we present a simple method to meet this need. We adopt the assumption that the photoionizing radiation field changes little over time, even if physical conditions change locally. With this assumption, the photoionization rate can be obtained from a published atmosphere model and can be used to determine the degree of hydrogen ionization when the temperature and electron density are specified. The application of our method indicates that in the chromospheric environment, plasma features contain more than 10% neutral hydrogen at temperatures lower than 17,000 K but less than 1% neutral hydrogen at temperatures higher than 23,000 K, implying that the hydrogen temperature determined from the Hα line is physically plausible if it is lower than 20,000 K, but may not be real, if it is higher than 25,000 K. We conclude that our method can be readily exploited to obtain a quick estimate of hydrogen ionization in plasma features in the solar chromosphere.
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来源期刊
Journal of Astronomy and Space Sciences
Journal of Astronomy and Space Sciences ASTRONOMY & ASTROPHYSICS-
CiteScore
1.30
自引率
20.00%
发文量
0
审稿时长
12 weeks
期刊介绍: JASS aims for the promotion of global awareness and understanding of space science and related applications. Unlike other journals that focus either on space science or on space technologies, it intends to bridge the two communities of space science and technologies, by providing opportunities to exchange ideas and viewpoints in a single journal. Topics suitable for publication in JASS include researches in the following fields: space astronomy, solar physics, magnetospheric and ionospheric physics, cosmic ray, space weather, and planetary sciences; space instrumentation, satellite dynamics, geodesy, spacecraft control, and spacecraft navigation. However, the topics covered by JASS are not restricted to those mentioned above as the journal also encourages submission of research results in all other branches related to space science and technologies. Even though JASS was established on the heritage and achievements of the Korean space science community, it is now open to the worldwide community, while maintaining a high standard as a leading international journal. Hence, it solicits papers from the international community with a vision of global collaboration in the fields of space science and technologies.
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