Aims.We investigate the flow field in the sunspot canopy using simultaneous Stokes vector spectropolarimetry of three sunspots (θ=27°, 50°, 75°) and their...
High resolution H alpha and white light observation of the birth of 73 active regions (AR) were used to check models of sunspots. It is concluded that large AR...
The GREGOR Fabry-Pérot Interferometer: Status, prospects, and scientific aims
The GREGOR Fabry-Pérot Interferometer (GFPI) is one of the first-light post-focus instruments for the German 1.5-meter GREGOR solar telescope at the...
We have observed the linear polarization of 21 bright grains of the photospheric network close to the disk center. The linear polarization of Fe I 6302.5 A was...
An analysis of high-resolution Stokes observations of two light bridges in active region NOAA 8990 is presented. The observations were recorded with the La...
The magnetic nature of umbra-penumbra boundary in sunspots
Context. Sunspots are the longest-known manifestation of solar activity, and their magnetic nature has been known for more than a century. Despite this, the...
The Magnetic Response of the Solar Atmosphere to Umbral Flashes
Chromospheric observations of sunspot umbrae offer an exceptional view of magnetoacoustic shock phenomena and the impact they have on the surrounding...
The magnetic structure of pores and sunspots derived from Advanced Stokes Polarimeter data.
We investigate the radial variation of the magnetic field structure across sunspots, pores and azimuth centers (ACs). We define ACs as magnetic structures of...
The multi-component field topology of sunspot penumbrae. A diagnostic tool for spectropolarimetric measurements
Context: .Sunspot penumbrae harbor highly structured magnetic fields and flows. The moving flux tube model offers an explanation for several observed phenomena...