R. Schlichenmaier
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View article: Spectral resolution effects on the information content in solar spectra
Spectral resolution effects on the information content in solar spectra Open
Context. When interpreting spectropolarimetric observations of the solar atmosphere, wavelength variations in the emergent intensity and polarization translate into information on the depth stratification of physical parameters such as the…
View article: Spectral resolution effects on the information content in solar spectra
Spectral resolution effects on the information content in solar spectra Open
When interpreting spectropolarimetric observations of the solar atmosphere, wavelength variations of the emergent intensity and polarization translate into information on the depth stratification of physical parameters. We aim to quantify …
View article: GRASS. II. Simulations of Potential Granulation Noise Mitigation Methods
GRASS. II. Simulations of Potential Granulation Noise Mitigation Methods Open
We present an updated version of the GRanulation And Spectrum Simulator (GRASS) which now uses an expanded library of 22 solar lines to empirically model time-resolved spectral variations arising from solar granulation. We show that our sy…
View article: Onset of penumbra formation
Onset of penumbra formation Open
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 with high spatial resolution. Aims. We investigate the sta…
View article: Decay of a photospheric transient filament at the boundary of a pore and the chromospheric response
Decay of a photospheric transient filament at the boundary of a pore and the chromospheric response Open
Context. The intermediate stages between pores and the formation of sunspots are a rare phenomenon and can be manifested as transient photospheric penumbral-like filaments. Although the magnetic field changes rapidly during the evolution o…
View article: Decay of a photospheric transient filament at the boundary of a pore and the chromospheric response
Decay of a photospheric transient filament at the boundary of a pore and the chromospheric response Open
Intermediate stages between pores and sunspots are a rare phenomenon and can manifest with the formation of transient photospheric penumbral-like filaments. Although the magnetic field changes rapidly during the evolution of such filaments…
View article: Effects of solar evolution on finite acquisition time of Fabry–Perot interferometers in high resolution solar physics
Effects of solar evolution on finite acquisition time of Fabry–Perot interferometers in high resolution solar physics Open
Context. The Visible Tunable Filter (VTF) imaging spectropolarimeter will be operated at the Daniel K. Inouye Solar Telescope (DKIST) in Hawaii. Due to its capability in resolving dynamic fine structure of smaller than 0.05 arcsec, the fin…
View article: Effects of solar evolution on finite acquisition time of Fabry-Perot-Interferometers in high resolution solar physics
Effects of solar evolution on finite acquisition time of Fabry-Perot-Interferometers in high resolution solar physics Open
The imaging spectro-polarimeter VTF (Visible Tunable Filter) will be operated at the Daniel K. Inouye Solar Telescope (DKIST). Due to its capability of resolving dynamic fine structure of smaller than 0.05'', the finite acquisition time of…
View article: The European Solar Telescope
The European Solar Telescope Open
The European Solar Telescope (EST) is a project aimed at studying the magnetic connectivity of the solar atmosphere, from the deep photosphere to the upper chromosphere. Its design combines the knowledge and expertise gathered by the Europ…
View article: Characterization of magneto-convection in sunspots
Characterization of magneto-convection in sunspots Open
Context. Observations have shown that in stable sunspots, the umbral boundary is outlined by a critical value of the vertical magnetic field component. However, the nature of the distinct magnetoconvection regimes in the umbra and penumbra…
View article: On the (in)stability of sunspots
On the (in)stability of sunspots Open
The stability of sunspots is one of the long-standing unsolved puzzles in the field of solar magnetism. We study the effects that destabilise and stabilise the flux tube of a simulated sunspot in the upper convection zone. The depth-varyin…
View article: On the (in)stability of sunspots
On the (in)stability of sunspots Open
Context. The stability of sunspots is one of the long-standing unsolved puzzles in the field of solar magnetism and the solar cycle. The thermal and magnetic structure of the sunspot beneath the solar surface is not accessible through obse…
View article: Characterization of the umbra–penumbra boundary by the vertical component of the magnetic field
Characterization of the umbra–penumbra boundary by the vertical component of the magnetic field Open
Context. The vertical component of the magnetic field was found to reach a constant value at the boundary between penumbra and umbra of stable sunspots in a recent statistical study of Hinode/SP data. This finding has profound implications…
View article: Characterization of the umbra-penumbra boundary by the vertical component of the magnetic field -- Analysis of ground-based data from the GREGOR Infrared Spectrograph
Characterization of the umbra-penumbra boundary by the vertical component of the magnetic field -- Analysis of ground-based data from the GREGOR Infrared Spectrograph Open
The vertical component of the magnetic field ($B_\perp$) was found to reach a constant value at the umbra-penumbra boundary of stable sunspots in a recent statistical study of Hinode/SP data. The objective of this work is to verify the exi…
View article: A distinct magnetic property of the inner penumbral boundary
A distinct magnetic property of the inner penumbral boundary Open
Context. Analyses of sunspot observations revealed a fundamental magnetic property of the umbral boundary: the invariance of the vertical component of the magnetic field. Aims. We analyse the magnetic properties of the umbra-penumbra bound…
View article: A distinct magnetic property of the inner penumbral boundary III. Analysis of simulated sunspots
A distinct magnetic property of the inner penumbral boundary III. Analysis of simulated sunspots Open
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 analyse the magnetic properties of the umbra-penumbra boundary …
View article: Science Requirement Document (SRD) for the European Solar Telescope (EST) (2nd edition, December 2019)
Science Requirement Document (SRD) for the European Solar Telescope (EST) (2nd edition, December 2019) Open
The European Solar Telescope (EST) is a research infrastructure for solar physics. It is planned to be an on-axis solar telescope with an aperture of 4 m and equipped with an innovative suite of spectro-polarimetric and imaging post-focus …
View article: Convective blueshifts in the solar atmosphere
Convective blueshifts in the solar atmosphere Open
Context. Convective motions in the solar atmosphere cause spectral lines to become asymmetric and shifted in wavelength. For photospheric lines, this differential Doppler shift varies from the solar disk center to the limb. Aims. Precise a…
View article: Convective blueshifts in the solar atmosphere: III. High-accuracy observations of spectral lines in the visible
Convective blueshifts in the solar atmosphere: III. High-accuracy observations of spectral lines in the visible Open
Convective motions in the solar atmosphere cause spectral lines to become asymmetric and shifted in wavelength. For photospheric lines, this differential Doppler shift varies from the solar disk center to the limb. Precise and comprehensiv…
View article: Science Requirement Document for the European Solar Telescope
Science Requirement Document for the European Solar Telescope Open
The European Solar Telescope (EST)1 is a research infrastructure for solar physics. It is planned to be an on-axis solar\ntelescope with an aperture of 4m and equipped with an innovative suite of spectro-polarimetric and imaging post-focus…
View article: Magnetic properties of a long-lived sunspot - Vertical magnetic field at the umbral boundary
Magnetic properties of a long-lived sunspot - Vertical magnetic field at the umbral boundary Open
Context. In a recent statistical study of sunspots in 79 active regions, the vertical magnetic field component $B_\text{ver}$ averaged along the umbral boundary is found to be independent of sunspot size. The authors of that study conclude…
View article: Magnetic properties of a long-lived sunspot
Magnetic properties of a long-lived sunspot Open
Context. In a recent statistical study of sunspots in 79 active regions, the vertical magnetic field component B ver averaged along the umbral boundary is found to be independent of sunspot size. The authors of that study conclude that the…
View article: Recent advancements in the EST project
Recent advancements in the EST project Open
View article: Absolute velocity measurements in sunspot umbrae
Absolute velocity measurements in sunspot umbrae Open
Context . In sunspot umbrae, convection is largely suppressed by the strong magnetic field. Previous measurements reported on negligible convective flows in umbral cores. Based on this, numerous studies have taken the umbra as zero referen…
View article: Photospheric Magnetic Fields of the Trailing Sunspots in Active Region NOAA 12396
Photospheric Magnetic Fields of the Trailing Sunspots in Active Region NOAA 12396 Open
The solar magnetic field is responsible for all aspects of solar activity. Sunspots are the main manifestation of the ensuing solar activity. Combining high-resolution and synoptic observations has the ambition to provide a comprehensive d…
View article: A distinct magnetic property of the inner penumbral boundary
A distinct magnetic property of the inner penumbral boundary Open
We recently presented evidence that stable umbra-penumbra boundaries are characterised by a distinct canonical value of the vertical component of the magnetic field, $B^{\rm stable}_{\rm ver}$. In order to trigger the formation of a penumb…
View article: A distinct magnetic property of the inner penumbral boundary. II. Formation of a penumbra at the expense of a pore
A distinct magnetic property of the inner penumbral boundary. II. Formation of a penumbra at the expense of a pore Open
We recently presented evidence that stable umbra-penumbra boundaries are characterised by a distinct canonical value of the vertical component of the magnetic field, $B^{\rm stable}_{\rm ver}$. In order to trigger the formation of a penumb…
View article: Inference of magnetic fields in the very quiet Sun
Inference of magnetic fields in the very quiet Sun Open
Context. Over the past 20 yr, the quietest areas of the solar surface have revealed a weak but extremely dynamic magnetism occurring at small scales (<500 km), which may provide an important contribution to the dynamics and energetics of t…
View article: Probing deep photospheric layers of the quiet Sun with high magnetic sensitivity
Probing deep photospheric layers of the quiet Sun with high magnetic sensitivity Open
\n Context. Investigations of the magnetism of the quiet Sun are hindered by extremely weak polarization signals in Fraunhofer spectral lines. Photon noise, straylight, and the systematically different sensitivity of the Zeeman effect to l…
View article: Three-dimensional structure of a sunspot light bridge
Three-dimensional structure of a sunspot light bridge Open
Context. Active regions are the most prominent manifestations of solar magnetic fields; their generation and dissipation are fundamental problems in solar physics. Light bridges are commonly present during sunspot decay, but a comprehensiv…