The emission-line spectrum above the limb of a solar coronal hole: 1175--1940 A
The emission-line spectrum above the limb of a solar coronal hole: 1175--1940 A
复制标题
太阳日冕洞边缘上方的发射线光谱：1175--1940 A
DOI：
10.1086/190387
复制
发表时间：
1976
影响因子：
8.7
通讯作者：
J. Purcell
中科院分区：
文献类型：
--
作者：
U. Feldman;G. Doschek;M. Vanhoosier;J. Purcell
本文讨论了在1175 - 1940 A波长范围内太阳白光边缘内和上方位置上的冕洞光谱。日冕洞与太阳的北极重合。光谱由Skylab上的NRL狭缝摄谱仪（SO 82-B）获得。光谱分辨率为0.06 A，投影到太阳上的狭缝面积为2“x 60”（1450 x 43500 km）。本文给出了在太阳大气温度约为8 × 10/sup ~ 3/ K至2.2 × 10/sup ~ 5/ K范围内形成的冕洞谱线的相对谱线强度和谱线轮廓。日冕洞线强度与最近公布的宁静太阳光谱得到的相应强度进行了比较。两个光学粗线的线轮廓被示出为肢体上方的高度的函数。随机质量运动速度推导出的光学薄冕洞线，并与相应的结果推导出安静的太阳光谱。（AIP）
Spectra of a coronal hole obtained at positions within and above the solar white-light limb in the wavelength range from 1175 to 1940 A are discussed. The coronal hole coincided with the north pole of the Sun. The spectra were obtained by the NRL slit spectrograph (SO82-B) on Skylab. The spectral resolution is 0.06 A and the projected slit area on the Sun was 2'' x 60'' (1450 x 43500 km). Relative line intensities and line profiles are presented for coronal-hole lines formed in the temperature region of the solar atmosphere from approx.8 x 10/sup 3/ K to 2.2 x 10/sup 5/ K. The coronal-hole line intensities are compared with corresponding intensities obtained from recently pulished quiet-Sun spectra. Line profiles of both optically thick lines are shown as a function of height above the limb. Random mass-motion velocities are deduced from the optically thin coronal-hole lines, and are compared with corresponding results deduced from quiet-Sun spectra. (AIP)