Astrophysics (Index)About

chromospheric activity index

(S-index, Mount Wilson S-index, flux index)
(measure of magnetic activity of a star's chromosphere)

The chromospheric activity index (or S-index) is a measure of the chromospheric magnetic field activity of a star. It is derivable from the star's spectroscopy, and is of interest regarding the Sun for comparison with other stars. A star's S-index changes over time, i.e., it is not a constant value.


(Sun,stars,magnetism,measure)
Further reading:
https://en.wikipedia.org/wiki/Chromosphere#Stellar_chromospheres
http://www.astrosurf.com/buil/chromospheric_activity/
https://exoplanetarchive.ipac.caltech.edu/docs/API_PSCompPars_columns.html
https://ui.adsabs.harvard.edu/abs/1995ApJ...438..269B/abstract
https://ui.adsabs.harvard.edu/abs/2017ApJ...835...25E/abstract
https://ui.adsabs.harvard.edu/abs/1978PASP...90..267V/abstract
https://ui.adsabs.harvard.edu/abs/1980PASP...92..385V/abstract
https://ui.adsabs.harvard.edu/abs/1968ApJ...153..221W/abstract

Index