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facula

Translation
facula
facular, adj.
/fak"yeuh leuh/, n., pl. faculae /-lee'/. Astron.
an irregular, unusually bright patch on the sun's surface.
[1700-10; < L: little torch, equiv. to fac- (s. of fax) torch + -ula -ULE]

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      in astronomy, bright granular structure on the Sun's surface that is slightly hotter or cooler than the surrounding photosphere. A sunspot always has an associated facula, though faculae may exist apart from such spots. Faculae are visible in ordinary white light near the Sun's limb (apparent edge), where the photospheric background is dimmer than near the centre of the disk. The extensions of faculae up into the chromosphere become visible over the entire disk in spectroheliograms taken at the wavelengths of hydrogen or ionized calcium vapour. When seen thus away from the limb, they are called chromospheric faculae or plages.

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Universalium. 2010.

Look at other dictionaries:

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  • façula — s. f. [Informal] Faceira.   ‣ Etimologia: face + ula …   Dicionário da Língua Portuguesa

  • fácula — s. f. Mancha luminosa que se vê às vezes no disco do Sol ou da Lua …   Dicionário da Língua Portuguesa

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  • facula — noun (plural faculae) Etymology: New Latin, from Latin, diminutive of fac , fax torch Date: 1706 any of the bright regions of the sun s photosphere seen most easily near the sun s edge …   New Collegiate Dictionary

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