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photosphere

[foh-tuh-sfeer] /ˈfoʊ təˌsfɪər/
noun
1.
a sphere of light or radiance.
2.
Astronomy. the luminous visible surface of the sun, being a shallow layer of strongly ionized gases.
Origin
1655-1665
1655-65; photo- + -sphere
Related forms
photospheric
[foh-tuh-sfer-ik, -sfeer-] /ˌfoʊ təˈsfɛr ɪk, -ˈsfɪər-/ (Show IPA),
adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for photospheric

photosphere

/ˈfəʊtəʊˌsfɪə/
noun
1.
the visible surface of the sun, several hundred kilometres thick
Derived Forms
photospheric (ˌfəʊtəʊˈsfɛrɪk) adjective
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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photospheric in Science
photosphere
  (fō'tə-sfîr')   
The lowest visible layer of a star, lying beneath the chromosphere and the corona. Stars are made entirely of gas and thus have no surface per se, but the gas beneath the photosphere is opaque, so the photosphere acts as their effective visible surface; it is also the boundary from which the Sun's diameter is measured. The Sun's photosphere is a very thin layer made up of numerous granules (transient convective cells) where hot gases rise and give off light and heat. The photosphere of the Sun has a temperature of around 6,000°K and is the region in which sunspot activity is located.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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