115 citations · 278 across the 12 of their papers we have counts for
12 papers
Comparative clustering analysis of Ca II 854.2 nm spectral profiles from simulations and observations
Thore E. Moe, Tiago M. D. Pereira, Luc Rouppe van der Voort +4
We aim to compare and contrast the typical shapes of synthetic Ca II 854.2 nm spectra found in Bifrost simulations having different magnetic activity with the spectral shapes found…
Shape-based clustering of synthetic Stokes profiles using k-means and k-Shape
Thore Espedal Moe, Tiago M. D. Pereira, Flavio Calvo +1
The shapes of Stokes profiles contain much information about the atmospheric conditions that produced them. However, a variety of different atmospheric structures can produce very…
Solar oxygen abundance using SST/CRISP center-to-limb observations of the O I 7772 Å line
A. G. M. Pietrow, R. Hoppe, M. Bergemann +1
Solar oxygen abundance measurements based on the O I near-infrared triplet have been a much-debated subject for several decades since non-local thermodynamic equilibrium (NLTE) cal…
Center-to-limb variation of spectral lines and continua observed with SST/CRISP and SST/CHROMIS
A. G. M. Pietrow, D. Kiselman, O. Andriienko +3
Observations of center-to-limb variations (CLV) of spectral lines and continua provide a good test for the accuracy of models of solar and stellar atmospheric structure and spectra…
Small-scale loops heated to transition region temperatures and their chromospheric signatures in the simulated solar atmosphere
M. Skan, S. Danilovic, J. Leenaarts +2
Recent observations revealed loop-like structures at very small scales visible in observables that sample transition region (TR) and coronal temperatures. Their formation remains u…
Physical properties of a fan-shaped jet backlit by an X9.3 flare
A. G. M. Pietrow, M. Druett, J. de la Cruz Rodriguez +2
Fan-shaped jets can be observed above light bridges and are driven by reconnection of the vertical umbral field with the more horizontal field above the light bridges. Because thes…
COCOPLOT: COlor COllapsed PLOTting software : Using color to view 3D data as a 2D image
Malcolm K. Druett, Alexander G. M. Pietrow, Gregal J. M. Vissers +2
Most modern solar observatories deliver data products formatted as 3D spatio-temporal data cubes, that contain additional, higher dimensions with spectral and/or polarimetric infor…
The Alfvénic nature of chromospheric swirls
Andrea Francesco Battaglia, José Roberto Canivete Cuissa, Flavio Calvo +2
We investigate the evolution and origin of small-scale chromospheric swirls by analyzing numerical simulations of the quiet solar atmosphere, using the radiative magnetohydrodynami…
Interaction of magnetic fields with a vortex tube at solar subgranular scale
C. E. Fischer, G. Vigeesh, P. Lindner +3
Using high-resolution spectropolarimetric data recorded with the Swedish 1 m Solar Telescope, we have identified several instances of granular lanes traveling into granules. These…
Structure of the Balmer jump. The isolated hydrogen atom
Flavio Calvo, Luca Belluzzi, Oskar Steiner
Context. The spectrum of the hydrogen atom was explained by Bohr more than one century ago. We revisit here some of the aspects of the underlying quantum structure, with a modern f…
Non-magnetic photospheric bright points in 3D simulations of the solar atmosphere
Flavio Calvo, Oskar Steiner, Bernd Freytag
Context. Small-scale bright features in the photosphere of the Sun, such as faculae or G-band bright points, appear in connection with small-scale magnetic flux concentrations. Aim…
Membrane instantons from a semiclassical TBA
Flavio Calvo, Marcos Marino
The partition function on the three-sphere of ABJM theory contains non-perturbative corrections which correspond to membrane instantons in M-theory. These corrections can be studie…