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flash spectrum

noun, Astronomy
1.
the emission spectrum of the chromosphere of the sun, which dominates the solar spectrum in the seconds just before and after a total solar eclipse.
Origin
1895-1900
1895-1900
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Article for flash spectrum

array of wavelengths detectable in the emissions from the limb of the Sun during the flash periods of a few seconds just after the beginning of totality during a solar eclipse or just before the instant of its termination. When the solar photosphere is occulted by the Moon, the layers of the Sun's atmosphere flash into prominence, and the spectrum briefly shows the bright lines produced by tenuous hot luminous gas. Except during eclipses, this part of the spectrum is masked by the glare of the Sun's disk. Study of the flash spectrum gives information about the physical state of the solar chromosphere. The flash spectrum was first observed by the American astronomer Charles Augustus Young during the eclipse of Dec. 22, 1870.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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