The Solar Stellar Activity Connection

M. LÓPEZ FUENTES

San Martín, Buenos Aires

Workshop; EXO.AR I: 1st Argentinian Workshop on Exoplanets ?Observations and data analysis?; 2017

The identification of stellar magnetic activity proxies, such as the presence of the absorption reversal of CaII H and K lines in stars from spectral types F to M, provides the possibility to explore the problem of solar activity and magnetic field generation in the broader context of stellar astrophysics. On the other side, the proximity of the Sun permits observations with a level of detail and resolution unthinkable for stars. For this reason, albeit being a single example of an active star, the Sun is a primer for activity phenomena. In this talk, we will present a review of the main observable features and characteristics that define solar activity, what are the mechanisms and processes for the generation and evolution of solar magnetic fields and how these connect with the results from broader stellar surveys and studies. In particular, we will explore how activity indices and cycle periods relate to rotation rates and stellar age, and the role of convection and differential rotation in different classes of stars. For its relevance to the problem of exoplanet detection, we will pay special attention to brightness variations in the Sun and stars due to the passage and evolution of surface and atmospheric features produced by magnetic activity. If time allows, we will briefly refer to other aspects of stellar activity that may be relevant for extrasolar planet research.