Explanipedia

The Daniel K. Inouye Solar Telescope – Observatory Overview Open

Thomas Rimmelé, M. Warner, S. L. Keil, Philip R. Goode, M. Knölker , et al. · 2020

We present an overview of the National Science Foundation’s Daniel K. Inouye Solar Telescope (DKIST), its instruments, and support facilities. The 4 m aperture DKIST provides the highest-resolution observations of the Sun ever achieved. Th…

Mid-infrared sizes of circumstellar disks around Herbig Ae/Be stars measured with MIDI on the VLTI Open

R. van Boekel, O. Chesneau, F. Malbet, Rainer H. Köhler, C. Dominik , et al. · 2019

We present the first long baseline mid-infrared interferometric observations of the circumstellar disks surrounding Herbig Ae/Be stars. The observations were obtained using the mid-infrared interferometric instrument MIDI at the European S…

Photospheric Magnetic Fields of the Trailing Sunspots in Active Region NOAA 12396 Open

M. Verma, H. Balthasar, C. Denker, Florian Böhm, C. E. Fischer , et al. · 2018

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…

Facilities For High Resolution Imaging Of The Sun Open

O. von der Lühe · 2018

The Sun is the only star where physical processes can be observed at their intrinsic spatial scales. Even though the Sun in a mere 150 million km from Earth, it is difficult to resolve fundamental processes in the solar atmosphere, because…

Spectropolarimetric Observations of an Arch Filament System with GREGOR Open

H. Balthasar, P. Gömöry, S. J. González Manrique, C. Kuckein, A. Kučera , et al. · 2018

We observed an arch filament system (AFS) in a sunspot group with the GREGOR Infrared Spectrograph attached to the GREGOR solar telescope. The AFS was located between the leading sunspot of negative polarity and several pores of positive p…

Simulation algorithm to model the visible tunable filter for the Daniel K. Inouye Solar Telescope Open

M. Schubert, T. Kentischer, O. von der Lühe · 2017

The visible tunable filter is an imaging spectropolarimeter for solar observations in visible light. The instrument consists of several Fabry–Pérot interferometers (FPIs), a polarization modulator, and a prefilter. It will be one of the fi…

<i>Clear</i>widens the field for observations of the Sun with multi-conjugate adaptive optics Open

Dirk Schmidt, Nicolas Gorceix, Philip R. Goode, José Bernardo Mariño Acebal, Thomas Rimmelé , et al. · 2017

The multi-conjugate adaptive optics (MCAO) pathfinder Clear on the New Solar Telescope in Big Bear Lake has provided the first-ever MCAO-corrected observations of the Sun that show a clearly and visibly widened corrected field of view comp…

Inference of magnetic fields in the very quiet Sun Open

M. J. Martínez González, A. Pastor Yabar, A. Lagg, A. Asensio Ramos, M. Collados , et al. · 2016

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…

Probing deep photospheric layers of the quiet Sun with high magnetic sensitivity Open

A. Lagg, S. K. Solanki, H.‐P. Doerr, M. J. Martínez González, T. L. Riethmüller , et al. · 2016

\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…

Spectropolarimetric observations of an arch filament system with the GREGOR solar telescope Open

H. Balthasar, P. Gömöry, S. J. González Manrique, C. Kuckein, J. Kavka , et al. · 2016

Arch filament systems occur in active sunspot groups, where a fibril structure connects areas of opposite magnetic polarity, in contrast to active region filaments that follow the polarity inversion line. We used the GREGOR Infrared Spectr…

Flows along arch filaments observed in the GRIS ‘very fast spectroscopic mode’ Open

S. J. González Manrique, C. Denker, C. Kuckein, A. Pastor Yabar, M. Collados , et al. · 2016

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-resolution observations often reveal multiple-component spec…

Deep probing of the photospheric sunspot penumbra: no evidence of field-free gaps Open

J. M. Borrero, A. Asensio Ramos, M. Collados, R. Schlichenmaier, H. Balthasar , et al. · 2016

Context. Some models for the topology of the magnetic field in sunspot penumbrae predict regions free of magnetic fields or with \nonly dynamically weak fields in the deep photosphere. \nAims. We aim to confirm or refute the existence of w…

Horizontal flow fields in and around a small active region Open

M. Verma, C. Denker, H. Balthasar, C. Kuckein, S. J. González Manrique , et al. · 2016

Aims. Combining high-resolution and synoptic observations aims to provide a\ncomprehensive description of flux emergence at photospheric level and of the\ngrowth process that eventually leads to a mature active region. Methods. Small\nacti…

Horizontal flow fields in and around a small active region-- The transition period between flux emergence and decay Open

M. Verma, C. Denker, H. Balthasar, C. Kuckein, S. J. González Manrique , et al. · 2016

Aims. Combining high-resolution and synoptic observations aims to provide a comprehensive description of flux emergence at photospheric level and of the growth process that eventually leads to a mature active region. Methods. Small active …

Slipping reconnection in a solar flare observed in high resolution with the GREGOR solar telescope Open

M. Sobotka, Jaroslav Dudík, C. Denker, H. Balthasar, J. Jurčák , et al. · 2016

\n A small flare ribbon above a sunspot umbra in active region 12205 was observed on November 7, 2014, at 12:00 UT in the blue imaging channel of the 1.5 m GREGOR telescope, using a 1 Å Ca ii H interference filter. Context observations fro…

Flows in and around Active Region NOAA12118 Observed with the GREGOR Solar Telescope and SDO/HMI Open

M. Verma, C. Denker, H. Balthasar, C. Kuckein, S. aJ. González Manrique , et al. · 2016

Flows in and around active region NOAA12118 observed with the GREGOR solar telescope and SDO/HMI Open

M. Verma, C. Denker, H. Balthasar, C. Kuckein, S. J. González Manrique , et al. · 2016

Accurate measurements of magnetic and velocity fields in and around solar active regions are key to unlocking the mysteries of the formation and the decay of sunspots. High spatial resolution image and spectral sequences with a high cadenc…

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