AA 2006/2007 Universit`a degli studi di Roma Tor Vergata Radiative properties of complex magnet... more AA 2006/2007 Universit`a degli studi di Roma Tor Vergata Radiative properties of complex magnetic elements in the solar photosphere. Thesis Author: Dr. Serena Criscuoli Thesis Advisors: Prof. Mark Rast, Prof. Francesco Berrilli Thesis Coordinator: Prof. Roberto Buonanno ...
We present an overview of the National Science Foundation’sDaniel K. Inouye Solar Telescope(DKIST... more We present an overview of the National Science Foundation’sDaniel 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. The large aperture of DKIST combined with state-of-the-art instrumentation provide the sensitivity to measure the vector magnetic field in the chromosphere and in the faint corona, i.e. for the first time with DKIST we will be able to measure and study the most important free-energy source in the outer solar atmosphere – the coronal magnetic field. Over its operational lifetime DKIST will advance our knowledge of fundamental astronomical processes, including highly dynamic solar eruptions that are at the source of space-weather events that impact our technological society. Design and construction of DKIST took over two decades. DKIST implements a fast (f/2), off-axis Gregorian optical design. The maximum available field-of-view is 5 arcmin. A complex t...
Global solar spectral irradiance variations depend on changes in magnetic flux concentrations at ... more Global solar spectral irradiance variations depend on changes in magnetic flux concentrations at the smallest scales. Modeling has focused on the contributions of magnetic structures in full disk images as those contributions have strong center-to-limb dependencies, but these dependencies have never been determined radiometrically; only the photometric intensity relative to some reference ’quiet-sun’1, the magnetic structure contrast, is measurable with ground based imagery. This is problematic because unresolved inhomogeneities influence not only the full-disk structure intensities themselves, but also the quiet-sun background against which their contrast is measured. We thus argue that, to understand the physical causes underlying solar spectral irradiance variations, two fundamental questions must be addressed: What is the real Iλ(μ) as a function of B in full-disk images? This can only be answered by imaging the Sun radiometrically from space, and we propose a Radiometric Solar ...
The solar acoustic oscillations are likely stochastically excited by convective dynamics in the s... more 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 unknown. Wave source identification requires measurements that can reliably discriminate the local wave signal from the background convective motions and resonant modal power. This is quite challenging as these noise contributions have amplitudes several orders of magnitude greater than the sources and the propagating wave fields they induce. In this paper, we employ a high-temporal-frequency filter to identify sites of acoustic emission in a radiative magnetohydrodynamic simulation. The properties of the filter were determined from a convolutional neural network trained to identify the two-dimensional acoustic Green’s function response of the atmosphere, but once defined, it can be directly applied to an image time series to extract the signal of local...
Abstract. In this paper we discuss recent developments in the capabilities of VAPOR: a desktop ap... more Abstract. In this paper we discuss recent developments in the capabilities of VAPOR: a desktop application that leverages today's powerful CPUs and GPUs to enable visualization and analysis of terascale data sets using only a commodity PC or laptop. We review VAPOR's current capabilities, highlighting support for Adaptive Mesh Refinement (AMR) grids, and present new developments in interactive feature-based visualization and statistical analysis.
AA 2006/2007 Universit`a degli studi di Roma Tor Vergata Radiative properties of complex magnet... more AA 2006/2007 Universit`a degli studi di Roma Tor Vergata Radiative properties of complex magnetic elements in the solar photosphere. Thesis Author: Dr. Serena Criscuoli Thesis Advisors: Prof. Mark Rast, Prof. Francesco Berrilli Thesis Coordinator: Prof. Roberto Buonanno ...
We present an overview of the National Science Foundation’sDaniel K. Inouye Solar Telescope(DKIST... more We present an overview of the National Science Foundation’sDaniel 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. The large aperture of DKIST combined with state-of-the-art instrumentation provide the sensitivity to measure the vector magnetic field in the chromosphere and in the faint corona, i.e. for the first time with DKIST we will be able to measure and study the most important free-energy source in the outer solar atmosphere – the coronal magnetic field. Over its operational lifetime DKIST will advance our knowledge of fundamental astronomical processes, including highly dynamic solar eruptions that are at the source of space-weather events that impact our technological society. Design and construction of DKIST took over two decades. DKIST implements a fast (f/2), off-axis Gregorian optical design. The maximum available field-of-view is 5 arcmin. A complex t...
Global solar spectral irradiance variations depend on changes in magnetic flux concentrations at ... more Global solar spectral irradiance variations depend on changes in magnetic flux concentrations at the smallest scales. Modeling has focused on the contributions of magnetic structures in full disk images as those contributions have strong center-to-limb dependencies, but these dependencies have never been determined radiometrically; only the photometric intensity relative to some reference ’quiet-sun’1, the magnetic structure contrast, is measurable with ground based imagery. This is problematic because unresolved inhomogeneities influence not only the full-disk structure intensities themselves, but also the quiet-sun background against which their contrast is measured. We thus argue that, to understand the physical causes underlying solar spectral irradiance variations, two fundamental questions must be addressed: What is the real Iλ(μ) as a function of B in full-disk images? This can only be answered by imaging the Sun radiometrically from space, and we propose a Radiometric Solar ...
The solar acoustic oscillations are likely stochastically excited by convective dynamics in the s... more 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 unknown. Wave source identification requires measurements that can reliably discriminate the local wave signal from the background convective motions and resonant modal power. This is quite challenging as these noise contributions have amplitudes several orders of magnitude greater than the sources and the propagating wave fields they induce. In this paper, we employ a high-temporal-frequency filter to identify sites of acoustic emission in a radiative magnetohydrodynamic simulation. The properties of the filter were determined from a convolutional neural network trained to identify the two-dimensional acoustic Green’s function response of the atmosphere, but once defined, it can be directly applied to an image time series to extract the signal of local...
Abstract. In this paper we discuss recent developments in the capabilities of VAPOR: a desktop ap... more Abstract. In this paper we discuss recent developments in the capabilities of VAPOR: a desktop application that leverages today's powerful CPUs and GPUs to enable visualization and analysis of terascale data sets using only a commodity PC or laptop. We review VAPOR's current capabilities, highlighting support for Adaptive Mesh Refinement (AMR) grids, and present new developments in interactive feature-based visualization and statistical analysis.
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Papers by Mark Rast