2024/01/15 by Ruben Lier, Lier, Ruben, Richard F. Green +5
Physics and Astronomy · #Solar and Space Plasma Dynamics #Stellar, planetary, and galactic studies #Astro and Planetary Science
paper · pdf · doi:10.48550/arxiv.2401.07622
We study the properties of plasma oscillations in the solar tachocline using shallow-water magnetohydrodynamic equations. These oscillations are expected to correlate with solar activity. We find new qualitative features in the equatorial spectrum of magnetohydrodynamic oscillations associated with magneto-Rossby and magneto-Yanai waves. By studying this spectrum in terms of band theory, we find that magneto-Kelvin and magneto-Yanai waves are topologically protected. This highlights the important role of these two classes of waves, as robust features of the plasma oscillation spectrum, in the interpretation of helioseismological observations.