102 citations · 462 across the 24 of their papers we have counts for
26 papers
1.5D investigation of the Hanle effect in the Ca I 4227 line using partial frequency redistribution. Comparison of synthetic Stokes profiles in Bifrost and MURaM-ChE rMHD models
Devang Agnihotri, L. S. Anusha, D. Przybylski +2
Modeling scattering polarization in the Ca I 4227 Å line is important for diagnosing chromospheric magnetic fields. We investigate the relative influence of formation heights and m…
Diversity of morphology of type II spicules in MURaM-ChE simulations
Sanghita Chandra, Robert Cameron, Damien Przybylski +1
Spicules are ubiquitous, small-scale features in the solar atmosphere, exhibiting a jet-like appearance most clearly identified by their apparent motion in off-limb observations. W…
A single frequency approach to nonequilibrium modeling of the chromosphere
W. Ruan, D. Przybylski, R. Cameron +1
The solar chromosphere is a region where radiation plays a critical role in energy transfer and interacts strongly with the plasma. In this layer, strong spectral lines, such as th…
Ca ii 854.2 nm in an enhanced network region simulated with MURaM-ChE
P. A. Ondratschek, D. Przybylski, H. N. Smitha +2
The Ca ii 854.2 nm line is widely used to study the chromosphere of the Sun. In the quiet Sun, the spatially averaged line profile shows a red asymmetry and a redshift of the line…
A self-consistent 3D MHD model producing a solar blowout jet
Yajie Chen, Hardi Peter, Damien Przybylski +2
Context. Solar blowout jets are a distinct subclass of ubiquitous extreme-ultraviolet (EUV) and X-ray coronal jets. Aims. Most existing models of blowout jets prescribe an initial…
Simulations of structured upflows from plumes and their connection to the solar wind
Kamlesh Bora, Lakshmi Pradeep Chitta, Yajie Chen +3
Small-scale transient jetlet activity and associated upflows from coronal hole plumes are potential sources of the solar wind. To elucidate the magnetic origins and driving mechani…
Magnetic reconnection sustains the mass budget of the solar wind
Yajie Chen, Hardi Peter, Damien Przybylski +2
The solar wind originates from regions of open magnetic fields on the Sun, but the relevant processes remain unsolved. We present a self-consistent numerical model of the source re…
Formation of chromospheric Fe I lines in the near ultraviolet in 1D atmospheres
E. Harnes, H. N. Smitha, A. Korpi-Lagg +2
In the near ultraviolet (NUV) part of the solar spectrum, there are several Fe I lines with very broad profiles, typical of chromospheric lines. These lines are largely unexplored…
Structure and dynamics of the internetwork solar chromosphere: results of a small-scale dynamo simulation
D. Przybylski, R. Cameron, S. K. Solanki +3
The heating and structure of the solar chromosphere depends on the underlying magnetic field, among other parameters. The lowest magnetic flux of the solar atmosphere is found in t…
Investigating explosive events in a 3D quiet-Sun model: Transition region and coronal response
Yajie Chen, Hardi Peter, Damien Przybylski
Transition region explosive events are characterized by non-Gaussian profiles of the emission lines formed at transition region temperatures, and they are believed to be manifestat…
Mg ii h&k spectra of an enhanced network region simulated with the MURaM-ChE code. Results using 1.5D synthesis
P. Ondratschek, D. Przybylski, H. N. Smitha +3
The Mg ii h&k lines are key diagnostics of the solar chromosphere. They are sensitive to the temperature, density, and non-thermal velocities in the chromosphere. The average Mg ii…
Testing MURaM and MPS-ATLAS against the quiet solar spectrum
Veronika Witzke, Alexander I. Shapiro, Nadiia M. Kostogryz +8
Three-dimensional (3D) radiative magnetohydrodynamics (MHD) simulations are the only way to model stellar atmospheres without any ad hoc parameterisations. Several 3D radiative MHD…
Small-scale dynamo in cool main sequence stars. II. The effect of metallicity
V. Witzke, H. B. Duehnen, A. I. Shapiro +4
All cool main sequence stars including our Sun are thought to have magnetic fields. Observations of the Sun revealed that even in quiet regions small-scale turbulent magnetic field…
Small-scale Dynamo in Cool Stars: I. Changes in stratification and near-surface convection for main-sequence spectral types
Tanayveer S. Bhatia, Robert H. Cameron, Sami K. Solanki +4
Some of the small-scale solar magnetic flux can be attributed to a small-scale dynamo (SSD) operating in the near-surface convection. The SSD fields have consequences for solar gra…
Chromospheric Extension of the MURaM Code
D. Przybylski, R. Cameron, S. K. Solanki +5
Detailed numerical models of chromosphere and corona are required to understand the heating of the solar atmosphere. An accurate treatment of the solar chromosphere is complicated…
Doppler shifts of spectral lines formed in the solar transition region and corona
Yajie Chen, Hardi Peter, Damien Przybylski +2
Context. Emission lines formed in the transition region and corona show dominantly redshifts and blueshifts, respectively. Aims. We investigate the Doppler shifts in a 3D radiation…
A solar coronal loop in a box: Energy generation and heating
C. Breu, H. Peter, R. Cameron +4
Coronal loops are the basic building block of the upper solar atmosphere. Comprehending how these are energized, structured, and evolve is key to understanding stellar coronae. Her…
Efficient numerical treatment of ambipolar and Hall drift as hyperbolic system
M. Rempel, D. Przybylski
Partially ionized plasmas, such as the solar chromosphere, require a generalized Ohm's law including the effects of ambipolar and Hall drift. While both describe transport processe…
Refactoring the MPS/University of Chicago Radiative MHD(MURaM) Model for GPU/CPU Performance Portability Using OpenACC Directives
Eric Wright, Damien Przybylski, Matthias Rempel +5
The MURaM (Max Planck University of Chicago Radiative MHD) code is a solar atmosphere radiative MHD model that has been broadly applied to solar phenomena ranging from quiet to act…
Transient small-scale brightenings in the quiet solar corona: a model for campfires observed with Solar Orbiter
Yajie Chen, Damien Przybylski, Hardi Peter +3
Context. Recent observations by the Extreme Ultraviolet Imager (EUI) on board Solar Orbiter have characterized prevalent small-scale transient brightenings in the corona above the…
Magnetic Imaging of the Outer Solar Atmosphere (MImOSA): Unlocking the driver of the dynamics in the upper solar atmosphere
H. Peter, E. Alsina Ballester, V. Andretta +20
The magnetic activity of the Sun directly impacts the Earth and human life. Likewise, other stars will have an impact on the habitability of planets orbiting these host stars. The…
Inversions of synthetic umbral flashes: effects of the scanning time on the inferred atmospheres
T. Felipe, H. Socas-Navarro, D. Przybylski
The use of instruments that record narrow band images at selected wavelengths is a common approach in solar observations. They allow the scanning of a spectral line by sampling the…
Heating of the partially ionized solar chromosphere by waves in magnetic structures
S. Shelyag, E. Khomenko, A. de Vicente +1
In this paper, we show a "proof of concept" of the heating mechanism of the solar chromosphere due to wave dissipation caused by the effects of partial ionization. Numerical modeli…
3D simulations of realistic power halos in magneto-hydrostatic sunspot atmospheres: linking theory and observation
Carlos Rijs, S. P. Rajaguru, Damien Przybylski +3
The well-observed acoustic halo is an enhancement in time-averaged Doppler velocity and intensity power with respect to quiet-sun values which is prominent for weak and highly incl…