Subjects: Astronomy submitted time 2023-12-15 Cooperative journals: 《天文学报》
Abstract： The corona is a key region of solar atmospheric activity, and the source of solar-terrestrial space weather. Limited by observation, research on the plasma structure and magnetic field state of the lower coronal atmosphere is still very lacking, and there are few international studies on the brightness stratification of the lower coronal atmosphere in the visible light band.In this paper, the coronal green line ($ rm Fe_{ Rmnum{14}}$5303 ; AA) observation data of Lijiang coronagraph YOGIS (Yunnan Green-line Imaging System) is used to analyze the bright structure and mid-coronal loops in the inner coronal region (1.03$R_{ odot}$--1.25$R_{ odot}$) effectively. By fitting the exponential decay of the intensity of the bright structures at the radial height of the sun, comparing these fitting results, it is found that the decay index of the static inner coronal loops obtained is around a fixed value. Then, the more obvious coronal loops are extracted, and by performing the same exponential fitting on the intensities of different heights, the obtained decay index is also relatively similar to that of the bright structure, which provides a reference for further study of the evolution of physical parameters in the corona.
Subjects: Astronomy >> Astrophysics submitted time 2023-05-16
Abstract： The corona is a key region of solar atmospheric activity,and the source of solar-terrestrial space weather.Limited by observation,research on the plasma structure and magnetic field state of the lower coronal atmosphere is still very lacking, and there are few international studies on the brightness stratification of the lower coronal atmosphere in the visible light band.In this paper,the coronal green line (FeXIV 5303 Å)
observation data of Lijiang coronagraph YOGIS is used to analyze the bright structure and mid-coronal loops in the inner coronal region (1.03R⊙-1.25R⊙) effectively.By fitting the exponential decay of the intensity of the bright structures at the radial height of the sun,comparing these fitting results,it is found that the decay index of the static inner coronal loops obtained is around a fixed value.Then,the more obvious coronal loops are extracted,and by performing the same exponential fitting on the intensities of different heights,the obtained decay index is also relatively similar to that of the bright structure,which provides a reference for further study of the evolution of physical parameters in the corona.
Subjects: Astronomy >> Astrophysical processes submitted time 2020-10-26 Cooperative journals: 《天文研究与技术》
Abstract：利用发射到平流层的球载太阳望远镜来观测太阳磁场演化和监视太阳活动有着得天独厚的优势。首先，在平流层中，球载太阳望远镜对太阳的观测不受来自地球对流层大气中天气现象的干扰，处于无视宁度影响的环境中。这为获取高质量的太阳图像提供了优越的条件。其次，平流层的空气已经十分稀薄，对紫外线的吸收也大为减弱。球载太阳望远镜能够在近紫外波段观测太阳活动和爆发。第三，球载太阳望远镜可以通过回收、升级和再利用来降低其使用成本并提高望远镜的利用率，远比空间观测经济实惠。利用球载太阳望远镜开展对太阳的观测研究在欧美已经有半个多世纪的历史。本文简要地回顾了太阳观测的球载任务发展历史，包括在这期间积累的非常丰富的仪器研制和观测经验，详细地介绍欧洲“日出”(SUNRISE)球载任务的仪器搭载、大量的高分辨观测数据和一系列在此基础上完成的高质量的科研成果，为我国球载望远镜的研制提供重要参考。
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