Other
Scientific paper
Feb 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000acasn..41...44z&link_type=abstract
Acta Astron. Sin., Vol. 41, No. 1, p. 44 - 50
Other
Solar Atmosphere: Temperatures, Solar Spectrum: Calcium Lines, Solar Spectrum: Line Profiles, Solar Spectrum: Variability
Scientific paper
Calcium K line as well as some other solar spectral lines have been measured regularly nearly every month since 1974 at Kitt Peak. It is now widely accepted that K1 is formed in the temperature minimum region (TMR) and that the distance of the component K1 from the line center and the intensity of K1 is well related to the position and temperature of TMR, respectively. The authors' study on the data of K line profiles and on the sunspot numbers over decades shows: in full disc integrated spectra the distance of K1 from the line center fluctuates in the same way as the sunspot number does, indicating a solar cyclic variation.
Ding Mingde
Fang Cheng
Livingston William Charles
Zhang Yunxiang
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