44 citations · 93 across the 8 of their papers we have counts for
8 papers
Average solar active region: I. Intensities, velocities, and the photospheric magnetic field
M. Švanda, J. Jurčák, M. Schmassmann
Context: Solar active regions (ARs) are key manifestations of the Sun's magnetic activity, displaying diverse spatial and temporal characteristics. Their formation and evolution pl…
Magnetic properties of the umbral boundary during sunspot decay. Comparative study of multiple datasets
M. García-Rivas, J. Jurčák, N. Bello González
The magnetic properties of the umbra-penumbra (UP) boundary of sunspots and the boundary of pores at various evolutionary stages have been characterised using datasets from differe…
Onset of penumbra formation
M. García-Rivas, J. Jurčák, N. Bello González +3
Context. Fully fledged penumbrae have been widely studied both observationally and theoretically. Yet the relatively fast process of penumbra formation has not been studied closely…
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…
Exploiting solar visible-range observations by inversion techniques: from flows in the solar subsurface to a flaring atmosphere
Michal Švanda, Jan Jurčák, David Korda +1
Observations of the Sun in the visible spectral range belong to standard measurements obtained by instruments both on the ground and in the space. Nowadays, both nearly continuous…
Science Requirement Document (SRD) for the European Solar Telescope (EST) (3rd Edition, December 2025)
Rolf Schlichenmaier, Luis R. Bellot Rubio, Manuel Collados Vera +31
The European Strategy Forum on Research Infrastructures (ESFRI) included the European Solar Telescope (EST) as an ESFRI Project in its 2016 Roadmap and confirmed this status in 202…
The magnetic nature of umbra-penumbra boundary in sunspots
Jan Jurčák, Reza Rezaei, Nazaret Bello González +2
Sunspots are the longest-known manifestation of solar activity, and their magnetic nature has been known for more than a century. Despite this, the boundary between umbrae and penu…
Normal and counter Evershed flows in the photospheric penumbra of a sunspot. SPINOR 2D inversions of Hinode-SOT/ SP observations
A. Siu-Tapia, A. Lagg, S. K. Solanki +2
Context. The Evershed effect, a nearly horizontal outflow of material seen in the penumbrae of sunspots in the photospheric layers, is a common characteristic of well-developed pen…