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Fraunhofer lines
(redirected from Fraunhofer line)

   Also found in: Wikipedia, Hutchinson 0.01 sec.
Fraunhofer lines (froun`hôfər): see sun sun, intensely hot, self-luminous body of gases at the center of the solar system . Its gravitational attraction maintains the planets, comets, and other bodies of the solar system in their orbits.
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Fraunhofer lines

In astronomical spectroscopy, dark lines in a star's spectrum caused by selective absorption of its radiation at specific wavelengths by the various chemical elements in its atmosphere. First observed in 1802, they are named for the German physicist Joseph von Fraunhofer (1787–1826), who from c. 1814 plotted over 500 of them and designated the brightest with the first few letters of the alphabet. About 25,000 Fraunhofer lines are known to exist in the Sun's spectrum, between the wavelengths of 2,950 and 10,000 angstroms.


Fraunhofer lines [′frau̇n‚hōf·ər ‚līnz]
(spectroscopy)
The dark lines constituting the Fraunhofer spectrum.


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In addition to holding over a dozen patents, Markle developed the solid Fabry Perot filters used in the hydrogen alpha telescopes utilized by the Skylab project, as well as the Fraunhofer Line Discriminator used for remote detection of weakly fluorescent materials.
 
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