Mark Rast
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View article: Observations of Locally Excited Waves in the Low Solar Atmosphere Using the Daniel K. Inouye Solar Telescope
Observations of Locally Excited Waves in the Low Solar Atmosphere Using the Daniel K. Inouye Solar Telescope Open
We present an interpretation of the recent Daniel K. Inouye Solar Telescope (DKIST) observations of propagating wave fronts in the lower solar atmosphere. Using MPS/University of Chicago MHD radiative magnetohydrodynamic simulations spanni…
View article: Dynamics of Large-Scale Solar Flows
Dynamics of Large-Scale Solar Flows Open
View article: Identifying Acoustic Wave Sources on the Sun. II. Improved Filter Techniques for Source Wavefield Seismology
Identifying Acoustic Wave Sources on the Sun. II. Improved Filter Techniques for Source Wavefield Seismology Open
In this paper, we refine a previously developed acoustic source filter, improving its reliability and extending its capabilities. We demonstrate how to fine-tune the filter to meet observational constraints and focus on specific wave-front…
View article: Ground-based Synoptic Studies of the Sun
Ground-based Synoptic Studies of the Sun Open
Whitepaper #140 in the Decadal Survey for Solar and Space Physics (Heliophysics) 2024-2033. Main topics: space weather applications; basic research. Additional topics: space weather research/operations/research loop; ground-based missions/…
View article: Dynamics of solar large-scale flows
Dynamics of solar large-scale flows Open
The Sun's axisymmetric large-scale flows, differential rotation and meridional circulation, are thought to be maintained by the influence of rotation on the thermal-convective motions in the solar convection zone. These large-scale flows a…
View article: Identifying Acoustic Wave Sources on the Sun. II. Improved Filter Techniques for Source Wavefield Seismology
Identifying Acoustic Wave Sources on the Sun. II. Improved Filter Techniques for Source Wavefield Seismology Open
In this paper we refine a previously developed acoustic-source filter (Bahauddin & Rast 2021), improving its reliability and extending its capabilities. We demonstrate how to fine-tune the filter to meet observational constraints and to fo…
View article: An Iterative OLA Method for Inversion of Solar Spectropolarimetric Data. I. Single- and Multiple-variable Inversions of Thermodynamic Quantities
An Iterative OLA Method for Inversion of Solar Spectropolarimetric Data. I. Single- and Multiple-variable Inversions of Thermodynamic Quantities Open
This paper describes an adaptation of the Optimally Localized Averaging (OLA) inversion technique, originally developed for geo- and helioseismological applications, to the interpretation of solar spectroscopic data. It focuses on invertin…
View article: An iterative OLA method for inversion of solar spectropolarimetric data: I. Single and multiple variable inversions of thermodynamic quantities
An iterative OLA method for inversion of solar spectropolarimetric data: I. Single and multiple variable inversions of thermodynamic quantities Open
This paper describes an adaptation of the Optimal Localized Averaging (OLA) inversion technique, originally developed for geo- and helioseismological applications, to the interpretation of solar spectroscopic data. It focuses on inverting …
View article: Identifying Acoustic Wave Sources on the Sun. I. Two-dimensional Waves in a Simulated Photosphere
Identifying Acoustic Wave Sources on the Sun. I. Two-dimensional Waves in a Simulated Photosphere Open
The solar acoustic oscillations are likely stochastically excited by convective dynamics in the solar photosphere, though few direct observations of individual source events have been made and their detailed characteristics are still unkno…
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 Daniel K. Inouye Solar Telescope – Observatory Overview
The Daniel K. Inouye Solar Telescope – Observatory Overview Open
We present an overview of the National Science Foundation’s Daniel K. Inouye Solar Telescope (DKIST), its instruments, and support facilities. The 4 m aperture DKIST provides the highest-resolution observations of the Sun ever achieved. Th…
View article: Single-particle dispersion in stably stratified turbulence
Single-particle dispersion in stably stratified turbulence Open
We present models for single-particle dispersion in vertical and horizontal\ndirections of stably stratified flows. The model in the vertical direction is\nbased on the observed Lagrangian spectrum of the vertical velocity, while the\nmode…
View article: Transport of Internetwork Magnetic Flux Elements in the Solar Photosphere
Transport of Internetwork Magnetic Flux Elements in the Solar Photosphere Open
The motions of small-scale magnetic flux elements in the solar photosphere can provide some measure of the Lagrangian properties of the convective flow. Measurements of these motions have been critical in estimating the turbulent diffusion…
View article: Magnetically Modulated Heat Transport in a Global Simulation of Solar Magneto-convection
Magnetically Modulated Heat Transport in a Global Simulation of Solar Magneto-convection Open
We present results from a global MHD simulation of solar convection in which the heat transported by convective flows varies in-phase with the total magnetic energy. The purely random initial magnetic field specified in this experiment dev…
View article: Turbulent transport with intermittency: Expectation of a scalar concentration
Turbulent transport with intermittency: Expectation of a scalar concentration Open
Scalar transport by turbulent flows is best described in terms of Lagrangian parcel motions. Here we measure the Eulerian distance travel along Lagrangian trajectories in a simple point vortex flow to determine the probabilistic impulse re…
View article: PHOTOMETRIC TRENDS IN THE VISIBLE SOLAR CONTINUUM AND THEIR SENSITIVITY TO THE CENTER-TO-LIMB PROFILE
PHOTOMETRIC TRENDS IN THE VISIBLE SOLAR CONTINUUM AND THEIR SENSITIVITY TO THE CENTER-TO-LIMB PROFILE Open
Solar irradiance variations over solar rotational timescales are largely determined by the passage of magnetic structures across the visible solar disk. Variations on solar cycle timescales are thought to be similarly due to changes in sur…
View article: THE EFFECTS OF MAGNETIC FIELD MORPHOLOGY ON THE DETERMINATION OF OXYGEN AND IRON ABUNDANCES IN THE SOLAR PHOTOSPHERE
THE EFFECTS OF MAGNETIC FIELD MORPHOLOGY ON THE DETERMINATION OF OXYGEN AND IRON ABUNDANCES IN THE SOLAR PHOTOSPHERE Open
We have explored the impact of magnetic fields on the determination of the solar photospheric oxygen and iron abundances using three-dimensional radiation–magnetohydrodynamic (MHD) simulations of convection. Specifically, we examined diffe…