32 citations · 110 across the 7 of their papers we have counts for
7 papers · 1 filter
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…
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…
A distinct magnetic property of the inner penumbral boundary III. Analysis of simulated sunspots
Jan Jurcak, Markus Schmassmann, Matthias Rempel +2
The analyses of sunspot observations revealed a fundamental magnetic property of the umbral boundary, the invariance of the vertical component of the magnetic field. We aim to anal…
Magnetic properties of a long-lived sunspot - Vertical magnetic field at the umbral boundary
Markus Schmassmann, Rolf Schlichenmaier, Nazaret Bello González
Context. In a recent statistical study of sunspots in 79 active regions, the vertical magnetic field component averaged along the umbral boundary is found to be inde…
A distinct magnetic property of the inner penumbral boundary. II. Formation of a penumbra at the expense of a pore
Jan Jurcak, Nazaret Bello Gonzalez, Rolf Schlichenmaier +1
We recently presented evidence that stable umbra-penumbra boundaries are characterised by a distinct canonical value of the vertical component of the magnetic field, $B^{\rm stable…
A distinct magnetic property of the inner penumbral boundary
Jan Jurčák, Nazaret Bello Gonzalez, Rolf Schlichenmaier +1
A sunspot emanates from a growing pore or protospot. In order to trigger the formation of a penumbra, large inclinations at the outskirts of the protospot are necessary. The penumb…