Journal ArticleDOI
The continuum of the extreme limb and the chromosphere at the 1970 eclipse
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TLDR
The flash spectra of the partial Sun and the chromosphere were obtained at the total solar eclipse on 7 March, 1970 and the distributions of the surface brightness of the continuum at six wavelengths in the visual region to compare them with the previous observations and the existing model atmospheres as discussed by the authors.Abstract:
The flash spectra of the partial Sun and the chromosphere were obtained at the total solar eclipse on 7 March, 1970. We studied the distributions of the surface brightness of the continuum at six wavelengths in the visual region to compare them with the previous observations and the existing model atmospheres. All of the distributions show a shallow dip and a small hump similar to those of Heintze's observation at the 1954 eclipse. But the hump in our results is of quite a different type from that given by Heintze's revised model. It was found that none of the existing model atmospheres can reproduce this hump. The intensity distribution in the low chromosphere was also examined.read more
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Journal ArticleDOI
The Brightness of the Helium D 3 Line in the Undisturbed Chromosphere from Eclipse Observations
TL;DR: In this article, the surface brightness distribution of the helium D3 line in the undisturbed chromosphere was obtained in agreement with results by other observers, and the available eclipse data on the D3 absolute brightness was analyzed by means of theoretical curves of growth.
Journal ArticleDOI
On the Sun's limb brightening in the visible
TL;DR: In this article, it was shown that in practice the method by Julius (1906) is incapable to determine the limb intensity drop and that the brief intensity reversal near the extreme limb as derived from cinematography of flash spectra can be explained by diffraction.
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High-cadence visible and infrared spectra of the Sun during eclipse
TL;DR: In this paper, the authors used optical fibers placed in the pupil planes of two small (D= 5 cm) telescopes, thereby integrating all light from the field of view to obtain novel spectra from 310 nm to 5.5 μm obtained during the 2017 August 21 eclipse.
Dissertation
L'interface photosphère solaire/chromosphère et couronne : apport des éclipses et des images EUV
TL;DR: In this paper, the authors describe the enveloppes d'helium dans les interfaces between the photosphere and the chromosphere of the limbe of Soleil.
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The He I and He II chromospheric shells and the Transition Region
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References
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Book
Principles of Optics
TL;DR: In this paper, the authors discuss various topics about optics, such as geometrical theories, image forming instruments, and optics of metals and crystals, including interference, interferometers, and diffraction.
Principles of Optics
TL;DR: In this article, the authors discuss various topics about optics, such as geometrical theories, image forming instruments, and optics of metals and crystals, including interference, interferometers, and diffraction.
Journal ArticleDOI
The Harvard-Smithsonian reference atmosphere
TL;DR: Harvard-Smithsonian reference atmosphere model of solar atmosphere, combining photosphere and quiet lower chromosphere as discussed by the authors, combines photosphere with low chromosphere and low photosphere respectively.
Journal ArticleDOI
The Bilderberg Model of the Photosphere and Low Chromosphere
Owen Gingerich,C. de Jager +1 more
TL;DR: The model is characterized by a flat temperature minimum of 4600°K between τ5000 ≈ 10−2 to 10−4 as discussed by the authors, and a hydrogen-helium ratio of 10 has been assumed.
Journal ArticleDOI
Physics of the Solar Chromosphere
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