Fraunhofer Lines
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Fraunhofer Lines
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Dark lines in the absorption
spectrum of solar
radiation due to absorption by gases in the outer portions of the sun and
in the earth's atmosphere.
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''Fraunhofer lines are designated by letters, as the K-line, or by
wavelength, as the 4046-angstrom line of iron.
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'The major Fraunhofer lines are:
angstroms (nm) | Line due to | |
A | 7594 | Telluric oxygen |
B | 6867 | Telluric oxygen |
C | 6563 | hydrogen, HMissing Image:img src="SP7-f_files/alphasm.html" |
D1 | 5896 | sodium |
D2 | 5890 | sodium |
D3 | 5876 | helium |
E | 5270 | iron and calcium |
b1 | 5184 | magnesium |
F | 4861 | hydrogen, HMissing Image:img src="SP7-f_files/betasm.html" |
G | 4308 | iron (and calcium) |
H | 3968 | calcium |
K | 3934 | calcium |
]]</dd>
References
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use