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coronagraph
(redirected from coronagraphs)

    Also found in: Dictionary/thesaurus, Wikipedia 0.03 sec.
coronagraph (kərō`nəgrăf'), device invented by the French astronomer B. Lyot (1931) for the purpose of observing the corona corona, luminous envelope surrounding the sun , outside the chromosphere. Its density is less than one billionth that of the earth's atmosphere. The corona is visible only at the time of totality during a total eclipse of the sun.
..... Click the link for more information.  of the sun and solar prominences occurring in the chromosphere chromosphere (krō`məsfēr') [Gr.
..... Click the link for more information. . Because of the intense light of the sun, the corona and chromosphere can ordinarily be seen only during a total eclipse eclipse (ēklĭps`, ĭ–) [Gr.
..... Click the link for more information. . 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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Combining adaptive optics with coronagraphs, devices that blot out the bright light of a parent star, will further hasten the discovery, Jaywardhana adds.
Are pictures of extrasolar planets in the offing? (Astronomy) by Science News
With adaptive optics systems and coronagraphs under development for several new telescopes, researchers have the capability to image planets, says Schneider.
Captured on Camera: Are They Planets? by COWEN, RON / Science News
The next coronagraphs planned solely by NASA will not orbit at all, but will rise aboard sounding rockets and long-duration balloons as part of a project called Max '91, to be conducted in 1992.
R.I.P. Solar Max: the satellite's last days by Eberhart, J. / Science News
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