4 papers
Sunspot simulations with MURaM -- I. Parameter study using potential field initial conditions
Markus Schmassmann, Nazaret Bello González, Rolf Schlichenmaier +1
Context. Existing sunspot simulations fail to reproduce the observed magnetic field distribution due to an artificially increased at the upper boundary. Aims. We explore…
The magnetic origin of the outer boundaries of sunspots
Markus Schmassmann, Nazaret Bello González, Jan JurÄák +1
Context. Sunspot boundaries are commonly outlined by contours of the continuum intensity. However, their magnetic nature has not yet been fully characterised. Aims. We investigate…
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…
The role of the Lorentz force in sunspot equilibrium
J. M. Borrero, A. Pastor Yabar, M. Schmassmann +3
Sunspots survive on the solar surface for time-scales ranging from days to months. This requires them to be in an equilibrium involving magnetic fields and hydrodynamic forces. Unf…