多波长观测的等离子体诊断和太阳日珥的alfvsamn波加热

IF 2.2 4区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS Publications of the Astronomical Society of Japan Pub Date : 2023-07-27 DOI:10.1093/pasj/psad049
Yuki Hashimoto, K. Ichimoto, Yuwei Huang
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引用次数: 0

摘要

太阳日珥是由日冕磁场支持的冷而致密的等离子体。它们是由称为线程的精细结构组成的。日珥被来自太阳大气的入射辐射加热,但先前的研究表明,额外的加热是必要的,以保持日珥的温度约104 K。本研究旨在从观测中定量地探讨日珥的机械加热。我们利用Hida天文台的无丘太阳望远镜对Hα (6563 Å)、Hβ (4861 Å)和Ca ii IR (8542 Å)的日珥进行了光谱观测。利用单平板模型拟合直线轮廓,通过求解统计平衡方程,估计了日珥的等离子体参数。假设湍流运动是传播的alfvsamn波的表现,从这些参数估计日珥的净辐射损失和alfvsamn波能量通量。结果发现,在日珥中心大部分地区,alfvsamn波的能量通量足以补偿净辐射损失。另一方面,在日珥的外围,alfvsamn波能量通量往往不足。在这些区域,需要考虑其他加热机制,如与日冕等离子体混合的焓通量。
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Plasma diagnostics and Alfvén wave heating of solar prominences by multiwavelength observations
Solar prominences are cool and dense plasma supported by the magnetic field in the solar corona. They are composed of fine-scale structures called threads. Prominences are heated by the incident radiation from the solar atmosphere, but previous studies have shown that additional heating is necessary to maintain the temperature of prominences of about 104 K. This study aims to investigate quantitatively the mechanical heating of the prominences from observations. We performed spectroscopic observations of prominences in Hα (6563 Å), Hβ (4861 Å), and Ca ii IR (8542 Å) with the Domeless Solar Telescope at Hida observatory. The plasma parameters of the prominences are estimated by fittings of line profiles using the single-slab model and by solving the statistical equilibrium equation. By assuming that the turbulent motion is the manifestation of propagating Alfvén waves, net radiative losses and Alfvén wave energy flux in the prominences are estimated from these parameters. As a result, it was found that the energy flux by Alfvén waves is sufficient to compensate for the net radiative losses in most regions of the central part of the prominences. On the other hand, Alfvén wave energy flux tends to be insufficient at the outer part of prominences. In such regions, another heating mechanism such as enthalpy flux of mixing with coronal plasma needs to be considered.
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来源期刊
Publications of the Astronomical Society of Japan
Publications of the Astronomical Society of Japan 地学天文-天文与天体物理
CiteScore
4.10
自引率
13.00%
发文量
98
审稿时长
4-8 weeks
期刊介绍: Publications of the Astronomical Society of Japan (PASJ) publishes the results of original research in all aspects of astronomy, astrophysics, and fields closely related to them.
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