3 papers
astro-ph.SR2026
Properties of granular light bridges
Michal Sobotka, Jan Jurcak, Marta Garcia-Rivas
Granular light bridges in sunspots are a manifestation of magnetoconvection in an approximately vertical magnetic field that is weaker than the field of the umbra. We study the rel…
astro-ph.SR2025
Apparent motion of penumbral grains in a sunspot simulation
Michal Sobotka, Markus Schmassmann
Context. The bright heads of penumbral filaments, penumbral grains (PGs), are manifestations of hot plasma flows rising to the surface. They are observed to move horizontally towar…
astro-ph.SR2023
Relation between magnetic field inclination and apparent motion of penumbral grains
Michal Sobotka, Jan Jurčák, J. Sebastián Castellanos Durán +1
Context. Bright heads of penumbral filaments, penumbral grains (PGs), show apparent horizontal motions inwards, towards the umbra, or outwards, away from the umbra. Aims. We aim to…