Description
Helioseismology uses the Sun's natural oscillations to infer properties about the Sun and its interior, while asteroseismology uses does the same for other stars. There are clear synergies between Sun-as-a-star helioseismology and asteroseismology in both observations and analysis techniques and thus helio- and asteroseismology are useful tools in studying the solar-stellar connection. In this talk, I will focus on a particular aspect of helio- and asteroseismology: the impact on the oscillations of magnetic fields. Magnetic fields change the properties of the oscillations used in helio- and asterseismology, including their frequencies, damping rates and amplitudes. I will detail how stellar activity cycles can impact the detectability of oscillations, which can, in turn, have an impact on exoplanet detections. I will also discuss the insights into solar and stellar magnetic activity that we can gain by studying how these parameters vary with time, including recent results that demonstrate how useful but underutilised high-frequency "pseudomodes" can be in this kind of study. Finally, I will describe how these magnetic-field induced variations can impact our ability to accurately determine stellar parameters, such as age, which is important in the context of the upcoming PLATO mission.
