arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1804.04089astro-ph.SR
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太阳活动周23和24期间日冕电子密度、温度和太阳光谱辐照度

Coronal electron density, temperature and solar spectral irradiance during the solar cycle 23 and 24

J. M Rodríguez Gómez, L. Vieira, A. Dal Lago, J. Palacios

摘要:

等离子体的电子密度和温度等参数在太阳大气动力学中起着关键的作用。这些特征在太阳物理学中很重要,因为它们可以帮助理解日冕中的物理学。目标是重建日冕中的电子密度和温度分布。研究了不同时间尺度下等离子体参数与发射的关系。我们提出了一个基于物理的模型来重建密度,温度和发射在EUV波段。该模型由通量输运模型、外推模型、排放模型和优化算法组成。CODET模型的参数是通过将模型的输出与TIMED/SEE记录而不是直接观测进行比较来限制的,因为它比目前可用的直接太阳观测覆盖更长的时间间隔。目前最重要的工作结果是,在EUV波段的特定波长的SSI变化的恢复,以及通过太阳大气的大时间尺度上的密度和温度的变化,与CODET模式。将介绍在第23和24太阳活动周期间,通过不同层日冕的电子密度和温度分布的演变。获得了发射图,它们与观测结果一致。此外,密度和温度图还与太阳大气不同层的磁场变化有关。

英文摘要:

The plasma parameters such as the electron density and temperature plays a key role in the dynamics of the solar atmosphere. These characteristics are important in solar physics, because they can help to understand the physics in the solar corona. The goal is to reconstruct the electron density and temperature distributions in the solar corona. The relations between emission and plasma parameters in different time scales are studied. We present a physics-based model to reconstruct the density, temperature and emission in the EUV band. This model called CODET is composed of a flux transport model, an extrapolation model, an emission model and an optimization algorithm. The CODET model parameters were constrained by comparing the model's output to the TIMED/SEE record instead of direct observations because it covers a longer time interval than the direct solar observations currently available. The most important results of the current work that the recovery of SSI variability in specific wavelengths in the EUV band, also the variations in density and temperature in large time scale through the solar atmosphere, with the CODET model. The evolution of the electron density and temperature profiles through the solar corona in different layers during the solar cycle 23 and 24, will be presented. The emission maps were obtained and they are in accordance to the observations. Also, the density and temperature maps are related to the variations of the magnetic field in different layers through the solar atmosphere.

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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