Journal ArticleDOI
Clues to the mode of excitation of Fe x ions in the solar corona from the 1980 eclipse observations
TLDR
In this paper, the authors used the multislit spectra of the coronal emission line taken at the 1980 eclipse to discuss the relative roles of radiative and collisional excitation mechanisms.Abstract:
The line and continuum intensities deduced from the multislit spectra of the (Fe X) coronal emission line taken at the 1980 eclipse are used to discuss the relative roles of radiative and collisional excitation mechanisms. It is shown that for R/R
⊙ < 1.2, collisional excitation is the predominant mode. Collisional as well as radiative excitation is equally important for 1.2 < R/R
⊙ < 1.4, whereas beyond 1.4 R
⊙ radiative excitation becomes dominant. The line width measurements indicate that a large number of locations have half-widths around 1.3 A. The maximum half-width is reached at ∼ 1.4 R
⊙ with an average value of 1.6 A.read more
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Observations of the Rings of Uranus from their Occultation of 158687
TL;DR: In this article, the authors studied the line profiles of the solar coronal forbidden lines Si VIII 1445.76 A, Fe XI 1467.08 A, and Fe XII 1242.03 A in quiet and active coronal regions from a survey of available limb spectral in the NRL Skylab data.
Journal ArticleDOI
Microscopic Nonthermal Plasma Motions of Coronal Loops in a Solar Active Region
Hirohisa Hara,Kiyoshi Ichimoto +1 more
TL;DR: In this article, the authors present a spectroscopic observation of a solar active region NOAA 7590 with a coronagraph at the Norikura Solar Observatory, which provides high-resolution spectra of the visible coronal emission lines (Fe X λ 6374, Fe XIV λ 5303, Ca XV λ5694) with a spatial sampling of 20×23.
Journal ArticleDOI
On the widths and ratios of Mg X 609.79 and 624.94 Å lines in polar off-limb regions
TL;DR: In this paper, the authors examined the variation of line width and line ratio in regions far off-limb at the Northern pole of the Sun using measurements of Mg 609.78 and 624.94 lines from the Coronal Diagnostic Spectrometer (CDS) on board SOHO.
Journal ArticleDOI
Analysis of the Fe X and Fe XIV line width in the solar corona using LASCO-C1 spectral data
TL;DR: In this article, the spectral data from LASCO-C1 aboard SOHO was used to analyze the variation in the line width with height in the inner corona (region above 1.1 R ⊙ ), by using spectral data acquired at activity minimum (August-October 1996) and during the ascending phase of the solar cycle (March 1998).
Journal ArticleDOI
Spectroscopic Studies of the Solar Corona II. Properties of Green and Red Emission Lines in Open and Closed Coronal Structures
TL;DR: In this paper, the authors obtained profiles of the green and red emission lines simultaneously on 1998 July 18-19 for about 4 hours with a cadence of 10 minutes, covering an area of about 200 �� × 500 �� in the solar corona.
References
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Journal ArticleDOI
The dynamical properties of the solar corona from intensities and line widths of EUV forbidden lines of Si VIII, Fe XI, and Fe XII
TL;DR: In this paper, the authors studied the line profiles of the solar coronal forbidden lines Si VIII 1445.76 A, Fe XI 1467.08 A, and Fe XII 1242.03 A in quiet and active coronal regions from a survey of available limb spectral in the NRL Skylab data.
Journal ArticleDOI
Measurements of extreme-ultraviolet emission-line profiles near the solar limb.
TL;DR: The line profiles of optically thin extreme-ultraviolet emission lines observed in a quiet sun region at positions within and above the white-light limb with the NRL slit spectrograph (S082-B) on Skylab are discussed in this article.
Journal Article
Observations of the Rings of Uranus from their Occultation of 158687
TL;DR: In this article, the authors studied the line profiles of the solar coronal forbidden lines Si VIII 1445.76 A, Fe XI 1467.08 A, and Fe XII 1242.03 A in quiet and active coronal regions from a survey of available limb spectral in the NRL Skylab data.
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