Ferreira, Rafael R.
Gonçalves, B.F.O.
Castro, Matthieu
2021-02-26
<p><strong>The magnetic phenomena on the solar surface have been the subject of several investigations over the last 400 years. The early indicator of the solar magnetic activity was the sunspot counting. The main indicators now are the International Sunspot Number, the Group Number, the Total Sunspot Area, and Photometric Sunspot Index. Several improvements in observational techniques have allowed measuring the magnetic activity using the solar/stellar spectra. The standard spectroscopic activity indicator is the S-index, based on the Ca II H&K emission lines, jointly the chromospheric component R'<sub>HK</sub>. Observations to stellar spots in other stars remain unclear, it is worth proposing a theoretical estimate to spot amount on other solar-type stars using the Sun as a star. We report a calibration between the spectroscopic chromospheric activity proxies (S-index and R'<sub>HK</sub>) and the sunspot indicators over the last decades. Our results indicate a quadratic power-law relationship.</strong></p>
https://doi.org/10.5281/zenodo.4567482
oai:zenodo.org:4567482
Zenodo
https://zenodo.org/communities/coolstars20half
https://doi.org/10.5281/zenodo.4567481
info:eu-repo/semantics/openAccess
Creative Commons Attribution 4.0 International
https://creativecommons.org/licenses/by/4.0/legalcode
CS20.5, The 20.5th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun, virtually anywhere, March 2-4, 2021
Cool Stars on the main sequence
sunspots
chromospheric activity
solar-like stars
Estimating stellar spots from Ca II H&K activity proxy in solar-like stars
info:eu-repo/semantics/conferencePoster