Sketch of a slender magnetic toroidal flux tube in equilibrium in the equatorial plane of a solar-like star (solid green line). The xy plane is the equatorial plane of the star as seen from the top of the vertical z axis. The barycenter of the star is O and its radius is R, while r₀ is the radius of the unperturbed flux tube. The convection zone of the star is rendered in orange, while the radiative zone, including the overshoot layer where the flux tube is located, is rendered in white. The flux tube perturbed by an oscillation mode with m = 8 is shown as a solid black line.