Solar limb darkening in the wings of the CaII H and K lines

The method for measuring solar limb darkening has been proposed, and the formulas, describing the law of solar limb darkening in the wings of the CaII H (396.849 nm) and K (393.369 nm) lines, have been derived. To operate at arbitrary points on the Sun’s surface, it is necessary to know the law of s...

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Bibliographic Details
Published inGeomagnetism and Aeronomy Vol. 49; no. 7; pp. 879 - 883
Main Author Ozhogina, O. A.
Format Journal Article
LanguageEnglish
Published Dordrecht SP MAIK Nauka/Interperiodica 01.12.2009
Springer Nature B.V
Subjects
Astronomy
Earth and Environmental Science
Earth Sciences
Geophysics/Geodesy
Measurement techniques
Spectrum analysis
Sun
Line Wing
Solar Phys
Flat Field
Coronal Hole
Solar Limb
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Summary:The method for measuring solar limb darkening has been proposed, and the formulas, describing the law of solar limb darkening in the wings of the CaII H (396.849 nm) and K (393.369 nm) lines, have been derived. To operate at arbitrary points on the Sun’s surface, it is necessary to know the law of solar limb darkening, which is specific in different spectral regions. The procedure of spectrum correction for a flat field, proposed in our previous works, is based on comparing line-free spectral regions with the solar center reference spectrum from the atlas by Brault and Neckel [1994].
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ISSN:0016-7932
1555-645X
0016-7940
DOI:10.1134/S0016793209070093