Variability of spectral lines in full-disk observations of the sun.
Abstract
Signals of solar activity have been searched for in full-disk line spectra of the sun. In the chromospheric lines Ca II H and K, and Hα, one finds that the central flux varies in concert with solar activity. Hγ shows no clear dependence on activity. Noticeable variations in the Ca II line flux are seen in the course of an hour. The photospheric Fe I λ5250 Å line tends to get deeper with increasing activity.
- Publication:
-
Institute of Theoretical Astrophysics, Blindern-Oslo
- Pub Date:
- 1983
- Bibcode:
- 1983ITABO..59...27B
- Keywords:
-
- Solar Activity:Spectral Lines;
- Solar Chromosphere:Spectral Lines;
- Spectral Lines:Solar Activity;
- Spectral Lines:Solar Chromosphere