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coronagraph |
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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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NIRCam will use coronagraphy to image and obtain spectra of debris disks and compare their properties with those of our own counterpart, the Kuiper Belt. |
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Coronagraphy
