Modelling stellar activity cycles using deep-seated dynamos and surface flux transport

TL;DR

This paper models stellar activity cycles by integrating deep-seated dynamo processes with surface flux transport, highlighting how magnetic flux emergence and surface dynamics influence stellar magnetic activity patterns.

Contribution

It introduces a combined model linking tachocline dynamos with surface flux transport, emphasizing the role of flux rise in shaping magnetic activity cycles.

Findings

Flux rise determines emergence latitudes and tilt angles.

Surface transport affects cyclic and non-cyclic magnetic flux patterns.

Dynamo strength influences activity cycle characteristics.

Abstract

We investigate the relations between tachocline-based dynamos and the surface flux transport mechanisms in stars with outer convection zones. Using our combined models of flux generation and transport, we demonstrate the importance of the buoyant rise of magnetic flux, which physically determines the emergence latitudes and tilt angles of bipolar magnetic regions. The combined effects of the dynamo strength, flux rise, and surface transport lead to various cyclic and non-cyclic time series of total unsigned surface magnetic flux.