CORONAGRAPH

kərōˈnəgrăfˌ, 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. Because of the intense light of the sun, the corona and chromosphere can ordinarily be seen only during a total eclipse. The coronagraph consists of two refracting telescopes in tandem. A solid disk placed in front of the prime focus of the first telescope plays the part of the moon and eclipses the sun's image in the telescope so that only the outer layers of the sun's atmosphere are focused by the second telescope onto photographic film. A monochromatic filter is also used to improve optical clarity and remove chromatic aberration.

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The Columbia Encyclopedia, Sixth Edition Copyright© 2004, Columbia University Press. Licensed from Lernout & Hauspie Speech Products N.V. All rights reserved.

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Questia Books and Articles on: Coronagraph
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books on: Coronagraph  - 14 results

       More book Results: 1-10 11-14 >>  
 
1.
Encyclopedia of the Solar System
Book by Lucy-Ann Mcfadden, Paul R. Weissman, Torrence V. Johnson; Academic Press, 2007
Subjects: Solar System--Encyclopedias
...instrument to perform this task is the so-called coronagraph. The coronagraph was in- vented by the French astronomer Bernard...from the surrounding environment. This makes a coronagraph the ideal instrument for direct imaging of extrasolar...
2.
Sunspots in Action
Book by Harlan True Stetson; Ronald Press Co., 1947
Subjects: Meteorology, Radio, Sunspots
...who, with special equipment which he called a coronagraph, first photographed the brightest part of the solar...de Midi in France in 1930. In the United States a coronagraph embodying many improvements has been set up in recent...
3.
A Dictionary of Astronomy
Book by Ian Ridpath; Oxford University Press, 1997
Subjects: Astronomy--Dictionaries
...Large Angle Spectroscopic Coronagraph on the SOHO spacecraft observes...rays and from white- light coronagraphs show such condensations to...white-light emission in coronagraph images. A large coronal...about 1013 kg. Spacecraft coronagraphs show that a typical CME consists...
4.
How It Works: Science and Technology - Vol. 5
Book by Marshall Cavendish; Marshall Cavendish, 2003
Subjects: Science--Encyclopedias, Technology--Encyclopedias
...eclipse to observe the corona. With an instrument called a coronagraph, they can arrange for the image of the Suns disk to be...only during a total eclipse or when astronomers use a coronagraph to create an artificial eclipse.
5.
Larousse Encyclopedia of Astronomy
Book by Lucien Rudaux, G. Vaucouleurs De, F. L. Whipple; Prometheus Press, 1962
Subjects: Astronomy
...was able to photograph the corona in full daylight. Lyots coronagraph consists, in principle, of a simple refracting telescope...equal to or greater than that of the corona itself. The coronagraph must therefore be installed at a considerable height above...
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magazine articles on: Coronagraph  - 7 results

       More magazine Results: 1-7 >>  
 
1.
The Sun's Halo in 3-D: New Perspectives on Solar Explosions
Magazine article by Ron Cowen; Science News, Vol. 170, August 19, 2006
Subjects: Eclipses, Solar--Evaluation, Eclipses, Solar--Observations, Sahara--Natural history, Solar eclipses--Evaluation, Solar eclipses--Observations
...Like SOHO, each of the craft has an occulting mask, or coronagraph, that blocks the glare of the sun. This creates an artificial...magnetic fields and the corona. Solar-B doesnt have a coronagraph to artificially mimic solar eclipses, leaving that to SOHO...
2.
Picturing Planets
Magazine article; Natural History, Vol. 113, September 2004
Subjects: Cameras, Corona, Oppenheimer, Ben R, Planets
...built a camera, called the Lyot Project Coronagraph, that blots out the blinding rays of...dormant volcano on Maui. The $2 million coronagraph was funded by the National Science Foundation...stars as Earth is to the Sun. Previous coronagraphs could only see larger brown dwarfs...
3.
The Lost Satellite
Magazine article by Bill Donahue; Popular Science, Vol. 278, April 2011
Subjects: Budgets, Cosmic rays, Earth, Satellites, Science
...mission." Instead, NOAA is interested in how the sun damages electronic equipment on Earth. It wants to equip DSCOVR with a coronagraph, an instrument that would monitor the plasma, particles and magnetic fi elds that stream out of the sun. Surges of plasma...
4.
Darkening the Sun
Magazine article by Craig Deforest; World and I, Vol. 13, July 1998
Subjects: Eclipses, Solar--Description and travel, Solar corona, Solar eclipses--Description and travel, Sun--Corona
...much more regularity than eclipse chasing allows. It has been almost 70 years since Bernard Ferdinand Lyot invented the "coronagraph" -- a special telescope that gives a dim view of the corona on a clear day. Since then, ground-based coronographs have...
5.
Ticket to Ride? Astrophysicists Mull a Return to the Moon
Magazine article by Ron Cowen; Science News, Vol. 171, March 24, 2007
Subjects: Moon exploration, Moon--Discovery and exploration, Moon--Observations, Radio telescopes--Usage
...solar system. The faint light from these orbs is swamped by the glare of their parent stars. Astronomers often place a coronagraph, or artificial mask, inside a telescope to blot out the light of the parent star. But such devices are costly. In Cashs...
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newspaper articles on: Coronagraph  - 1 result

 
 
1.
Quite Some Cloud on the Horizon
Newspaper article by Richard Warburton; The Birmingham Post (England), February 19, 2000
...are unpredictable and in the past they have wiped out satellites as they pass through the atmosphere. "On board Soho is a coronagraph called LASCO which we designed to spot the CMEs when they first surface from the sun in the outer atmosphere. "Ahead of...


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encyclopedia articles on: Coronagraph  - 5 results

 
 
1.
Coronagraph
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
CORONAGRAPH k ro n graf , device invented by the French astronomer B. Lyot (1931...chromosphere can ordinarily be seen only during a total eclipse . The coronagraph consists of two refracting telescopes in tandem. A solid disk placed...
2.
Fomalhaut
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
...stars, lying at a distance of 25 light-years, and images made in 2004 and 2006 by the Hubble Space Telescope using a coronagraph show a planet orbiting the star. Its name is from the Arabic meaning "mouth of the southern fish...
3.
Chromosphere
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
...a method of observing them with a spectroscope at any clear time of day was developed, and in 1930 the invention of the coronagraph allowed them to be continuously photographed. Solar Flares Another phenomenon occurring in the chromosphere is the solar...
4.
Corona , in Astronomy
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
...extends far out into space. The corona consists of ionized gas at a temperature of 1 million degrees Celsius. By means of the coronagraph , the innermost part of the corona can be studied and photographed in full daylight. Although the visible corona extends...
5.
Sun , in Astronomy
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
...measured by an instrument called the pyrheliometer. Other instruments devised especially for the study of the sun are the coronagraph and the spectroheliograph . These instruments have revealed a number of interesting phenomena occurring during the periods...


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