Solar variability in the Ca II K line during solar cycles 21 and 22.
Abstract
The authors have monitored the Sun in the light of the Ca II K line and obtained the disc integrated profiles for the year 1974 - 91. From these profiles they have estimated the variability of the Sun as a star as seen in the various K line parameters. The 1 Å index shows an increase of about 35% in 1990 from its minimum value attained in 1986 - 87.
- Publication:
-
Bulletin of the Astronomical Society of India
- Pub Date:
- September 1993
- Bibcode:
- 1993BASI...21..655S
- Keywords:
-
- Calcium;
- K Lines;
- Solar Cycles;
- Solar Spectra;
- Variability;
- Data Reduction;
- Optical Paths;
- Spectroheliographs;
- Spectrum Analysis;
- Solar Physics