16 citations · 27 across the 7 of their papers we have counts for
7 papers · 1 filter
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…
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…
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…
Flows along arch filaments observed in the GRIS 'very fast spectroscopic mode'
S. J. González Manrique, C. Denker, C. Kuckein +28
A new generation of solar instruments provides improved spectral, spatial, and temporal resolution, thus facilitating a better understanding of dynamic processes on the Sun. High-r…
A study on Ca II 854.2 nm emission in a sunspot umbra using a thin cloud model
H. Hamedivafa, M. Sobotka, L. Bellot Rubio +1
In the present work, we introduce and explain a method of solution of the radiative transfer equation based on a thin cloud model. The efficiency of this method to retrieve dynamic…
Orphan penumbrae: Submerging horizontal fields
J. Jurcak, L. R. Bellot Rubio, M. Sobotka
We investigate the properties of orphan penumbrae, which are photospheric filamentary structures observed in active regions near polarity inversion lines that resemble the penumbra…
Large-scale horizontal flows in the solar photosphere V: Possible evidence for the disconnection of bi-polar sunspot groups from their magnetic roots
Michal Svanda, Mirek Klvana, Michal Sobotka
In a recent paper (Svanda et al., 2008, A&A 477, 285) we pointed out that, based on the tracking of Doppler features in the full-disc MDI Dopplergrams, the active regions display t…