Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...122...88o&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 122, no. 1-2, June 1983, p. 88-94. Research supported by the Netherlands Found
Astronomy and Astrophysics
Astrophysics
11
Calcium, K Lines, Solar Activity Effects, Solar Spectra, Spectroheliographs, Calibrating, Chromosphere, Irradiance, Metal Ions, Solar Atmosphere, Solar Cycles, Solar Flux
Scientific paper
Solar full disk Ca II K line spectrograms obtained during the maximum activity of cycle 21 have yielded observational parameters characterizing the line core emission from the sun as a star, together with numerical relations between these parameters. The Ca II K line-core emission is found to vary during the activity maximum by almost as much as the mean difference between solar maximum and solar minimum values, and the distance between the K1 minima increases markedly with increasing core emission. In addition, the violet/red asymmetry in the emission core decreases with increasing emission, and the inner line wings brighten.
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