Coronagraph
Related Category: Astronomy: General
(kr´ngrf´´), device invented by the French astronomer B. Lyot (1931) for the purpose of observing the corona of the sun and solar prominences occurring in the chromosphere.
Coronagraph
A coronagraph is a telescopic attachment designed specifically to block out the harsh, direct light from a star, so that nearby objects can be resolved without burning out the telescope's optics.
coronagraph
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Definition: coronagraph: A special telescope which blocks light from the disk of the Sun in order to study the solar atmosphere. See the image on the right for more information.
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Coronagraphs allow us to see the corona on the limb, but in order to see it on the disk, it has to be looked at through an X-ray telescope.
coronagraph
an instrument designed to block light from the solar disk, allowing the corona to be observed
coronagraphic mask ...
Coronagraph
A telescope designed to photograph the inner corona of the sun.
Coronal Hole ...
Coronagraph. An instrument that allows study of the Sun's inner corona at times of non-eclipse.
Coronagraph
(a) Device for studying the Solar corona at any time of the day. It was first invented by Bernard Lyot.
Coronagraph An instrument that makes it possible to observe the corona at times other than during an eclipse. A simple lens focuses the Sun onto a disk that blocks the light from the solar disk, providing an artificial eclipse.
Coronagraph
Interferometry
Optics
[edit] References
^ Bracewell, Ronald N. (1978), "Detecting nonsolar planets by spinning infrared interferometer", Nature 274: 780-781, 1978-08-24, doi:10.1038/274780a0, ISSN 0028-0836 ...
Coronagraphs allow us to see only the outer parts of the corona, because the instrument blocks our view of the inner corona. X-ray images can show us the parts closer to the Sun, because there's no need to block out the solar disk.
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coronagraph - An instrument for photographing the chromosphere and corona of the sun outside of eclipse.
cosmic background radiation - The microwave radiation coming from all directions that is believed to be the redshifted glow of the big bang.
Coronagraph
A type of telescope designed to view the Sun's Corona.
Cosmic rays ...
coronagraph - (n.)
A type of telescope with which the corona can be seen at times other than that of a total solar eclipse.
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84. Coronagraph
A telescope designed to photograph the inner corona of the sun.
Large Angle and Spectrometric Coronagraph (SOHO Glossary - GSFC) Coronagraph aboard SOHO. LASCO actually consists of three coronagraphs: C1, C2, and C3. large calorie (NASA SP-7, 1965) = kilogram calorie. See calorie.
It is observed at solar eclipse or with the coronagraph. The shape of the corona varies during the sunspot cycle. At sunspot minimum the corona has large extensions along the sun's equator, with short brushlike tufts near the poles.
corona 1) The upper level of the solar atmosphere, characterized by low densities and high temperatures ( 1.0E+06 K); it is not visible from the Earth except during a total eclipse of the sun or by use of special telescopes called coronagraphs. 2) An ...
Each of these planets is very young and very warm, glowing bright enough to be seen, but the real technical obstacle was being able to negate the contrast ratio between the host star and the planet, which was overcome through use of a coronagraph to ...
As currently planned, the TPF will include two complementary observatory groups: a visible-light coronagraph to launch around 2014; and a "formation-flying" infrared interferometer to launch before 2020, ...
The earliest evidence of these dynamical events came from observations made with a coronagraph on the 7th Orbiting Solar Observatory (OSO 7) from 1971 to 1973.
Among the advances in observational instruments that have significantly influenced solar physics are the spectroheliograph, which measures the spectrum of individual solar features; the coronagraph, ...
An observable change in coronal structure that occurs on a time scale between a few minutes and several hours, and involves the appearance of a new discrete, bright, white light feature in the coronagraph field of view, ...
Large Angle and Spectrometric Coronagraph Experiment [LASCO]
Doubling of the interplanetary magnetic field [Ulysses]
SOHO's latest surprise - gas near the Sun heading the wrong way [Goddard] ...
Bernard-Ferdinand Lyot
1897-1952
French
invented the coronagraph
Otto Struve
1897-1963
Russian-born American
made detailed spectroscopic studies of close binary stars; discovered interstellar matter (H II regions) ...
[3.7] THE SCHMIDT TELESCOPE / THE CORONAGRAPH
[4.0] Advanced Technology Telescopes
[4.1] THE HALE TELESCOPE ...
A corona is a type of plasma "atmosphere" of the Sun or other celestial body, extending millions of kilometres into space, most easily seen during a total solar eclipse, but also observable in a coronagraph.
carbon-rich, hydrogen-poor eruptive variable supergiants. The prototype is R CrB, an F8-G0 Ib star with a large infrared excess and a rather high 7Li abundance. It has fluctuated from 6th magnitude to 14th magnitude. [H76]
Coronagraph ...
In the 1930s the French astronomer Bernard Lyot introduced the coronagraph, which made possible spectral observations of the corona when the Sun is not in eclipse, and the birefringent filter, which permitted two-dimensional monochromatic images.
1930 - Bernard-Ferdinand Lyot invents the coronagraph
1930 - Karl Jansky builds a 30-meter long rotating aerial radio telescope
1933 - Bernard-Ferdinand Lyot invents the Lyot filter ...
 See also: Corona, Solar, Sun, Telescope, Earth
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