487 citations · 1.4k across the 18 of their papers we have counts for
18 papers
The 85-electrode AO system of the Swedish 1-m Solar Telescope
G. B. Scharmer, G. Sliepen, J. -C. Sinquin +3
We discuss the chosen concepts, detailed design, implementation and calibration of the 85-electrode adaptive optics (AO) system of the Swedish 1-meter Solar Telescope (SST), which…
Design and Performance Analysis of a Highly Efficient Polychromatic Full-Stokes Polarization Modulator for the CRISP Imaging Spectrometer
A. G. de Wijn, J. de la Cruz Rodríguez, G. B. Scharmer +2
We present the design and performance of a polychromatic polarization modulator for the CRisp Imaging SpectroPolarimeter (CRISP) Fabry-Perot tunable narrow-band imaging spectropola…
High-resolution observations of the solar photosphere, chromosphere and transition region. A database of coordinated IRIS and SST observations
L. H. M. Rouppe van der Voort, B. De Pontieu, M. Carlsson +30
NASA's Interface Region Imaging Spectrograph (IRIS) provides high resolution observations of the solar atmosphere through UV spectroscopy and imaging. Since the launch of IRIS in J…
Is the sky the limit? Performance of the revamped Swedish 1-m Solar Telescope and its blue- and red-beam re-imaging systems
Goran Scharmer, Mats Lofdahl, Guus Sliepen +1
We demonstrate that for data recorded with a solar telescope that uses adaptive optics and/or post-processing to compensate for many low- and high-order aberrations, the RMS granul…
Dissecting bombs and bursts: non-LTE inversions of low-atmosphere reconnection in SST and IRIS observations
G. J. M. Vissers, J. de la Cruz Rodriguez, T. Libbrecht +3
Ellerman bombs and UV bursts are transient brightenings that are ubiquitously observed in the lower atmospheres of active and emerging flux regions. Here we present inversion resul…
The dark side of penumbral microjets: Observations in Hα
D. Buehler, S. Esteban Pozuelo, J. de la Cruz Rodriguez +1
We present data of 10 penumbral microjets (PMJs) observed in Hα, Ca II 8542 Å, and Fe I 6302 Åline pair with the Swedish 1 m Solar Telescope (SST) with CRISP and Ca II K with SST/C…
SSTRED: Data- and metadata-processing pipeline for CHROMIS and CRISP
M. G. Löfdahl, T. Hillberg, J. de la Cruz Rodriguez +5
Context: Data from ground-based, high-resolution solar telescopes can only be used for science with calibrations and processing, which requires detailed knowledge about the instrum…
Intermittent reconnection and plasmoids in UV bursts in the low solar atmosphere
L. Rouppe van der Voort, B. De Pontieu, G. B. Scharmer +9
Magnetic reconnection is thought to drive a wide variety of dynamic phenomena in the solar atmosphere. Yet the detailed physical mechanisms driving reconnection are difficult to di…
Response to "Stray-light correction in 2D spectroscopy" by R. Schlichenmaier and M. Franz
G. B. Scharmer
We discuss a recent paper by Schlichenmaier & Franz (SF; 2013, A&A, 555, A84), in which the claim is made that the penumbral dark downflows detected for the first time with the Swe…
Sources of straylight in the post-focus imaging instrumentation of the Swedish 1-m Solar Telescope
M. G. Löfdahl, G. B. Scharmer
Recently measured straylight PSFs in Hinode/SOT make granulation contrast in observed data and synthetic MHD data consistent. Data from earthbound telescopes also need accurate cor…
SST/CRISP Observations of Convective Flows in a Sunspot Penumbra
G. B. Scharmer, V. M. J. Henriques
Context. Recent discoveries of intensity correlated downflows in the interior of a sunspot penumbra provide direct evidence for overturning convection, adding to earlier strong ind…
Striation and convection in penumbral filaments
H. C. Spruit, G. B. Scharmer, M. G. Löfdahl
Observations with the 1-m Swedish Solar Telescope of the flows seen in penumbral filaments are presented. Time sequences of bright filaments show overturning motions strikingly sim…
Small-scale convection signatures associated with strong plage solar magnetic field
G. Narayan, G. B. Scharmer
In this work, we study and quantify properties of strong-field small-scale convection and compare observed properties with those predicted by numerical simulations. We analyze spec…
High-order aberration compensation with Multi-frame Blind Deconvolution and Phase Diversity image restoration techniques
G. B. Scharmer, M. G. Löfdahl, T. I. M. van Werkhoven +1
Context. For accurately measuring intensities and determining magnetic field strengths of small-scale solar (magnetic) structure, knowledge of and compensation for the point spread…
S-DIMM+ height characterization of day-time seeing using solar granulation
G. B. Scharmer, T. I. M. van Werkhoven
To evaluate site quality and to develop multi-conjugative adaptive optics systems for future large solar telescopes, characterization of contributions to seeing from heights up to…
CRISP Spectropolarimetric Imaging of Penumbral Fine Structure
G. B. Scharmer, G. Narayan, T. Hillberg +6
We discuss penumbral fine structure in a small part of a pore, observed with the CRISP imaging spectropolarimeter at the Swedish 1-m Solar Telescope (SST), close to its diffraction…
Fine structure, magnetic field and heating of sunspot penumbrae
H. C. Spruit, G. B. Scharmer
We interpret penumbral filaments as due to convection in field-free, radially aligned gaps just below the visible surface of the penumbra, intruding into a nearly potential field a…
Observational manifestations of solar magneto-convection -- center-to-limb variation
Mats Carlsson, Robert F. Stein, Ake Nordlund +1
We present the first center-to-limb G-band images synthesized from high resolution simulations of solar magneto-convection. Towards the limb the simulations show "hilly" granulatio…