487 citations · 1.3k across the 16 of their papers we have counts for
16 papers
torchmfbd: a flexible multi-object multi-frame blind deconvolution code
A. Asensio Ramos, C. Díaz Baso, C. Kuckein +2
Post-facto image restoration techniques are essential for improving the quality of ground-based astronomical observations, which are affected by atmospheric turbulence. Multi-objec…
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…
The European Solar Telescope
C. Quintero Noda, R. Schlichenmaier, L. R. Bellot Rubio +14
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…
Multi-frame blind deconvolution and phase diversity with statistical inclusion of uncorrected high-order modes
Mats G. Löfdahl, Tomas Hillberg
Images collected with ground-based telescopes suffer blurring and distortions from turbulence in Earth's atmosphere. Adaptive optics (AO) can only partially compensate for these ef…
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…
Mapping the magnetic field of flare coronal loops
D. Kuridze, M. Mathioudakis, H. Morgan +9
Here we report on the unique observation of flaring coronal loops at the solar limb using high resolution imaging spectropolarimetry from the Swedish 1-meter Solar Telescope. The v…
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…
Off-disk straylight measurements for the Swedish 1-meter Solar Telescope
Mats G. Löfdahl
Context. Accurate photometry with ground based solar telescopes requires characterization of straylight. Scattering in Earth's atmosphere and in the telescope optics are potentiall…
CRISPRED: A data pipeline for the CRISP imaging spectropolarimeter
J. de la Cruz Rodríguez, M. Löfdahl, P. Sütterlin +2
The production of science-ready data from major solar telescopes requires expertise beyond that of the typical observer. This is a consequence of the increasing complexity of instr…
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…
A tilted interference filter in a converging beam
Mats G. Löfdahl, Vasco M. J. Henriques, Dan Kiselman
Context. Narrow-band interference filters can be tuned toward shorter wavelengths by tilting them from the perpendicular to the optical axis. This can be used as a cheap alternativ…
Evaluation of image-shift measurement algorithms for solar Shack-Hartmann wavefront sensors
Mats G. Löfdahl
Context. Solar Shack-Hartmann wavefront sensors measure differential wavefront tilts as the relative shift between images from different subapertures. There are several methods in…
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…
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…
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…
Multi-frame blind deconvolution with linear equality constraints
Mats G. Lofdahl
The Phase Diverse Speckle (PDS) problem is formulated mathematically as Multi Frame Blind Deconvolution (MFBD) together with a set of Linear Equality Constraints (LECs) on the wave…