51Թ

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Fraunhofer lines

plural noun

Astronomy.
  1. the dark lines of the solar spectrum.


Fraunhofer lines

/ ˈڰܲԳːə /

plural noun

  1. a set of dark lines appearing in the continuous emission spectrum of the sun. It is caused by the absorption of light of certain wavelengths coming from the hotter region of the sun by elements in the cooler outer atmosphere
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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51Թ History and Origins

Origin of Fraunhofer lines1

First recorded in 1830–40; named after J. von Fraunhofer
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51Թ History and Origins

Origin of Fraunhofer lines1

named after J. von Fraunhofer (1787–1826), German physicist
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Example Sentences

Examples have not been reviewed.

In his series "Fraunhofer Lines", blocks of color and shadow are set against heavily censored government reports, such as that by the U.S Senate into torture allegations at the base in Guantanamo Bay.

From

That’s where NASA’s Joanna Joiner of the Goddard Space Flight Center in Greenbelt, Md., and Christian Frankenberg of the Jet Propulsion Laboratory in Pasadena, Calif., came in, with their innovative use of an electromagnetic phenomenon known as Fraunhofer lines.

From

These bands are so pronounced in the part of the spectrum between the Fraunhofer lines F and D, as to leave the solar spectrum unrecognizable....

From

Consequently they are known as Fraunhofer lines, or dark absorption lines.

From

This photograph completely confirms Young’s discovery, and shows the prominent Fraunhofer lines bright, the bright lines of the chromosphere spectrum being especially conspicuous.

From

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