Chromospheric observations of sunspot umbrae offer an exceptional view of magnetoacoustic shock phenomena and the impact they have on the surrounding...
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PublicationThe Magnetic Response of the Solar Atmosphere to Umbral Flashes
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PublicationThe Magnetic Sensitivity of the Ba II D1 and D2 Lines of the Fraunhofer Spectrum
The physical interpretation of the spectral line polarization produced by the joint action of the Hanle and Zeeman effects offers a unique opportunity to obtain...
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PublicationThe Magnetic Sensitivity of the Stokes I Profile of the 15260 Å Line of Mn I
The near-IR line of Mn I at 15262.7 Å has recently been proposed as a new tool for diagnosing the magnetic field strength and magnetic energy density associated...
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PublicationThe 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...
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PublicationThe magnetic SW Sextantis star RXJ1643.7+3402
We present time-resolved spectroscopy and circular spectropolarimetry of the SW Sex star RXJ1643.7+3402. We find significant polarization levels exhibiting a...
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PublicationThe Magnetized Disk-Halo Transition Region of M51
An excellent laboratory for studying large scale magnetic fields is the grand design face-on spiral galaxy M51. Due to wavelength-dependent Faraday...
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PublicationThe Motion of Magnetic Flux Tubes in the Convection Zone and the Subsurface Origin of Active Regions
The rise of kink-unstable magnetic flux tubes through the solar convection zone is discussed with a view to explaining the subsurface origin of active regions...
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PublicationThe 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...
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PublicationThe Physical Origin of the Scattering Polarization of the Na I D Lines in the Presence of Weak Magnetic Fields
We demonstrate that the atomic alignment of the hyperfine-structure components of the ground-level S1/2 of Na I and of the upper-level P1/2 of the D1 line are...