Solar variability in the CaII K during solar cycles 21 and 22

Details Solar variability in the CaII K during solar cycles 21 and 22 Solar variability in the CaII K during solar cycles 21 and 22

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993basi...21..655s&link_type=abstract

Astronomical Society of India, Bulletin (ISSN 0304-9523), vol. 21, no. 3-4, p. 655-657

Astronomy and Astrophysics

Astronomy

1

Calcium, K Lines, Solar Cycles, Solar Spectra, Variability, Data Reduction, Optical Paths, Spectroheliographs, Spectrum Analysis

Scientific paper

We have monitored the sun in the light of the CaII K line and obtained
the disc integrated profiles for the years 1974-91. From these profiles
we have estimated the variability of the sun as a star as seen in the
various K line parameters. The 1 A index shows an increase of about 35%
in 1990 from its minimum value attained in 1986-87.

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