Lucas A. Tarr
YOU?
Author Swipe
View article: Spectropolarimetric Inversion in Four Dimensions with Deep Learning (SPIn4D). II. A Physics-informed Machine Learning Method for 3D Solar Photosphere Reconstruction
Spectropolarimetric Inversion in Four Dimensions with Deep Learning (SPIn4D). II. A Physics-informed Machine Learning Method for 3D Solar Photosphere Reconstruction Open
Inferring the three-dimensional (3D) solar atmospheric structures from observations is a critical task for advancing our understanding of the magnetic-fields and electric currents that drive solar activity. In this work, we introduce a nov…
View article: Spatiotemporal Low First Ionization Potential Abundance: A Catalyst for Coronal Condensation
Spatiotemporal Low First Ionization Potential Abundance: A Catalyst for Coronal Condensation Open
Radiative losses play a critical role in the cooling of plasmas. When chromospheric plasma is sufficiently heated, it can flow into coronal loops, which subsequently cool down due to radiation. From observations, we infer that this cooling…
View article: Exact Nonlinear Decomposition of Ideal-MHD Waves Using Eigenenergies. III. Gravity, Generalized Inhomogeneous Quasi-linear Partial Differential Equations, Mode Conversion, and Numerical Implementation
Exact Nonlinear Decomposition of Ideal-MHD Waves Using Eigenenergies. III. Gravity, Generalized Inhomogeneous Quasi-linear Partial Differential Equations, Mode Conversion, and Numerical Implementation Open
Precise tracking and measurement of the energy carried by the individual magnetohydrodynamic (MHD) modes has important implications and utility in both astrophysical and laboratory plasmas. Previously, this was only achievable in limited l…
View article: The Ubiquity of Twisted Flux Ropes in the Quiet Sun
The Ubiquity of Twisted Flux Ropes in the Quiet Sun Open
Models and observations have demonstrated that twisted flux ropes (TFRs) play a significant role in the structure and eruptive dynamics of active regions. Their role in the dynamics of the quiet Sun atmosphere has remained elusive, their f…
View article: Simulating the Photospheric to Coronal Plasma Using Magnetohydrodyanamic Characteristics. II. Reflections on Non-reflecting Boundary Conditions
Simulating the Photospheric to Coronal Plasma Using Magnetohydrodyanamic Characteristics. II. Reflections on Non-reflecting Boundary Conditions Open
We present our implementation of non-reflecting boundary conditions in the magnetohydrodynamics (MHD) code LaRe3D . This implementation couples a characteristics-based boundary condition with a Lagrangian remap code, demonstrating the gene…
View article: Exact Nonlinear Decomposition of Ideal-MHD Waves Using Eigenenergies III: Gravity, Generalized Inhomogeneous Quasi-linear PDEs, Mode Conversion, and Numerical Implementation
Exact Nonlinear Decomposition of Ideal-MHD Waves Using Eigenenergies III: Gravity, Generalized Inhomogeneous Quasi-linear PDEs, Mode Conversion, and Numerical Implementation Open
Precise tracking and measurement of the energy carried by the individual magnetohydrodynamic (MHD) modes has important implications and utility in astrophysical and laboratory plasmas. Previously, this was only achievable in limited linear…
View article: Simulating the photospheric to coronal plasma using magnetohydrodyanamic characteristics II: reflections on non-reflecting boundary conditions
Simulating the photospheric to coronal plasma using magnetohydrodyanamic characteristics II: reflections on non-reflecting boundary conditions Open
We present our implementation of non-reflecting boundary conditions in the magnetohydrodynamics (MHD) code LaRe3D. This implementation couples a characteristics-based boundary condition with a Lagrangian remap code, demonstrating the gener…
View article: Exact Nonlinear Decomposition of Ideal-MHD Waves Using Eigenenergies. II. Fully Analytical Equations and Pseudoadvective Eigenenergies
Exact Nonlinear Decomposition of Ideal-MHD Waves Using Eigenenergies. II. Fully Analytical Equations and Pseudoadvective Eigenenergies Open
Physical insight into plasma evolution in the magnetohydrodynamic (MHD) limit can be revealed by decomposing the evolution according to the characteristic modes of the system. In this paper we explore aspects of the eigenenergy decompositi…
View article: Spectropolarimetric Inversion in Four Dimensions with Deep Learning (SPIn4D). I. Overview, Magnetohydrodynamic Modeling, and Stokes Profile Synthesis
Spectropolarimetric Inversion in Four Dimensions with Deep Learning (SPIn4D). I. Overview, Magnetohydrodynamic Modeling, and Stokes Profile Synthesis Open
The National Science Foundation’s Daniel K. Inouye Solar Telescope (DKIST) will provide high-resolution, multiline spectropolarimetric observations that are poised to revolutionize our understanding of the Sun. Given the massive data volum…
View article: Exact Nonlinear Decomposition of Ideal-MHD Waves Using Eigenenergies II: Fully Analytical EEDM Equations and Pseudo-Advective Energies
Exact Nonlinear Decomposition of Ideal-MHD Waves Using Eigenenergies II: Fully Analytical EEDM Equations and Pseudo-Advective Energies Open
Physical insight into plasma evolution in the magnetohydrodynamic (MHD) limit can be revealed by decomposing the evolution according to the characteristic modes of the system. In this paper we explore aspects of the eigenenergy decompositi…
View article: Spectropolarimetric Inversion in Four Dimensions with Deep Learning (SPIn4D): I. Overview, Magnetohydrodynamic Modeling, and Stokes Profile Synthesis
Spectropolarimetric Inversion in Four Dimensions with Deep Learning (SPIn4D): I. Overview, Magnetohydrodynamic Modeling, and Stokes Profile Synthesis Open
The National Science Foundation's Daniel K. Inouye Solar Telescope (DKIST) will provide high-resolution, multi-line spectropolarimetric observations that are poised to revolutionize our understanding of the Sun. Given the massive data volu…
View article: Exact Nonlinear Decomposition of Ideal-MHD Waves Using Eigenenergies
Exact Nonlinear Decomposition of Ideal-MHD Waves Using Eigenenergies Open
In this paper, we introduce a new method for exact decomposition of propagating, nonlinear magnetohydrodynamic (MHD) disturbances into their component eigenenergies associated with the familiar slow, Alfvén, and fast wave eigenmodes, and t…
View article: Exact Nonlinear Decomposition of Ideal-MHD Waves Using Eigenenergies
Exact Nonlinear Decomposition of Ideal-MHD Waves Using Eigenenergies Open
In this paper we introduce a new method for exact decomposition of propagating, nonlinear magnetohydrodynamic (MHD) disturbances into their component eigenenergies associated with the familiar slow, Alfvén, and fast wave eigenmodes, and th…
View article: Simulating the Photospheric to Coronal Plasma Using Magnetohydrodynamic Characteristics. I. Data-driven Boundary Conditions
Simulating the Photospheric to Coronal Plasma Using Magnetohydrodynamic Characteristics. I. Data-driven Boundary Conditions Open
We develop a general description of how information propagates through a magnetohydrodynamic (MHD) system based on the method of characteristics and use that to formulate numerical boundary conditions that are intrinsically consistent with…
View article: Simulating the photospheric to coronal plasma using magnetohydrodyanamic characteristics I: data-driven boundary conditions
Simulating the photospheric to coronal plasma using magnetohydrodyanamic characteristics I: data-driven boundary conditions Open
We develop a general description of how information propagates through a magnetohydrodynamic (MHD) system based on the method of characteristics and use that to formulate numerical boundary conditions (BCs) that are intrinsically consisten…
View article: Frequency Agile Solar Radiotelescope
Frequency Agile Solar Radiotelescope Open
The Frequency Agile Solar Radiotelescope (FASR) has been strongly
View article: Investment in people is essential to sustain a diverse and engaged workforce
Investment in people is essential to sustain a diverse and engaged workforce Open
This white paper addresses the issue of how to broaden the participation of employees at heliophysics research centers by diversifying the scope and responsibility of diversity equity and inclusion (DEI) efforts at large research facilitie…
View article: Resolving 3D Coronal Loop Physics with Spectropolarimetry and Off-limb Solar Adaptive Optics
Resolving 3D Coronal Loop Physics with Spectropolarimetry and Off-limb Solar Adaptive Optics Open
View article: Enabling data-driven modeling and real-time prediction of the dynamic solar atmosphere
Enabling data-driven modeling and real-time prediction of the dynamic solar atmosphere Open
Cutting edge research of the region between the solar photosphere and Alfvén surface, where the solar wind disconnects from the solar surface, increasingly relies on largescale computational modeling.This is true not just for numerical exp…
View article: Spatio-temporal comparisons of the hydrogen-alpha line width and ALMA 3 mm brightness temperature in the weak solar network
Spatio-temporal comparisons of the hydrogen-alpha line width and ALMA 3 mm brightness temperature in the weak solar network Open
Comparisons between the Atacama Large Millimeter/sub-millimeter Array (ALMA) 3 mm emission and a range of optical and UV solar observations have found the strongest correspondence between the width of the hydrogen alpha line at 656.3 nm an…
View article: Spatio-Temporal Comparisons of the Hydrogen-Alpha Line Width and ALMA 3 mm Brightness Temperature in the Weak Solar Network
Spatio-Temporal Comparisons of the Hydrogen-Alpha Line Width and ALMA 3 mm Brightness Temperature in the Weak Solar Network Open
The strongest known correspondence between ALMA 3mm emission and other solar observations is between the H-alpha line width and 3 mm brightness temperature, while the typical 3-5min p-mode oscillations found in many chromospheric diagnosti…
View article: A Publicly Available Multiobservatory Data Set of an Enhanced Network Patch from the Photosphere to the Corona
A Publicly Available Multiobservatory Data Set of an Enhanced Network Patch from the Photosphere to the Corona Open
New instruments sensitive to chromospheric radiation at X-ray, UV, visible, IR, and submillimeter wavelengths have become available that significantly enhance our ability to understand the bidirectional flow of energy through the chromosph…
View article: A publicly available multi-observatory data set of an enhanced network\n patch from the Photosphere to Corona
A publicly available multi-observatory data set of an enhanced network\n patch from the Photosphere to Corona Open
New instruments sensitive to chromospheric radiation at X-ray, UV, Visible,\nIR, and sub-mm wavelengths have become available that significantly enhance our\nability to understand the bi-directional flow of energy through the\nchromosphere…
View article: Measurements of Photospheric and Chromospheric Magnetic Field Structures Associated with Chromospheric Heating over a Solar Plage Region
Measurements of Photospheric and Chromospheric Magnetic Field Structures Associated with Chromospheric Heating over a Solar Plage Region Open
In order to investigate the relation between magnetic structures and the signatures of heating in plage regions, we observed a plage region with the He i 1083.0 nm and Si i 1082.7 nm lines on 2018 October 3 using the integral field unit mo…
View article: Measurements of Photospheric and Chromospheric Magnetic Field Structures\n Associated with Chromospheric Heating over a Solar Plage Region
Measurements of Photospheric and Chromospheric Magnetic Field Structures\n Associated with Chromospheric Heating over a Solar Plage Region Open
In order to investigate the relation between magnetic structures and the\nsignatures of heating in plage regions, we observed a plage region with the He\nI 1083.0 nm and Si I 1082.7 nm lines on 2018 October 3 using the integral field\nunit…
View article: Critical Science Plan for the Daniel K. Inouye Solar Telescope (DKIST)
Critical Science Plan for the Daniel K. Inouye Solar Telescope (DKIST) Open
View article: The Formation and Dissipation of Current Sheets and Shocks due to Compressive Waves in a Stratified Atmosphere Containing a Magnetic Null
The Formation and Dissipation of Current Sheets and Shocks due to Compressive Waves in a Stratified Atmosphere Containing a Magnetic Null Open
We study the propagation and dissipation of magnetohydrodynamic waves in a set of numerical models that each include a solar--like stratified atmosphere and a magnetic field with a null point. All simulations have the same magnetic field c…
View article: The formation and dissipation of current sheets and shocks due to compressive waves in a stratified atmosphere containing a magnetic null
The formation and dissipation of current sheets and shocks due to compressive waves in a stratified atmosphere containing a magnetic null Open
We study the propagation and dissipation of magnetohydrodynamic waves in a set of numerical models that each include a solar--like stratified atmosphere and a magnetic field with a null point. All simulations have the same magnetic field c…
View article: Science Objective: Understanding Energy Transport by Alfvénic Waves in Solar Flares
Science Objective: Understanding Energy Transport by Alfvénic Waves in Solar Flares Open
Solar flares are driven by the release of magnetic energy from reconnection events in the solar corona, whereafter energy is transported to the chromosphere, heating the plasma and causing the characteristic radiative losses. In the collis…
View article: Relating magnetic reconnection to coronal heating
Relating magnetic reconnection to coronal heating Open
It is clear that the solar corona is being heated and that coronal magnetic fields undergo reconnection all the time. Here we attempt to show that these two facts are related—i.e. coronal reconnection generates heat. This attempt must addr…