Results 21 to 30 of about 487,950 (322)
Ideas and Tools for Error Detection in Opacity Databases
Atoms, 2023 In this article, we propose several ideas and tools in order to check the reliability of radiative opacity and atomic physics databases. We first emphasize that it can be useful to verify that mathematical inequalities, which impose lower and upper ...
Jean-Christophe Pain, Patricia Croset
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How Well do We Understand the Planck Feedback?
Journal of Advances in Modeling Earth Systems, 2023 A reference or “no‐feedback” radiative response to warming is fundamental to understanding how much global warming will occur for a given change in greenhouse gases or solar radiation incident on the Earth.
Timothy W. Cronin, Ishir Dutta
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The link between outgoing longwave radiation and the altitude at which a spaceborne lidar beam is fully attenuated [PDF]
Atmospheric Measurement Techniques, 2017 According to climate model simulations, the changing altitude of middle and high clouds is the dominant contributor to the positive global mean longwave cloud feedback.
T. Vaillant de Guélis +6 more
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Opacity Sampling in Radiative Acceleration Calculations [PDF]
The Astrophysical Journal, 2000 The accuracy requirements on atomic data for the calculation of stellar evolution with atomic diffusion are determined. In particular, the density of frequency grids needed for precise radiative acceleration (grad) calculations via the sampling method are presented.
F. LeBlanc, G. Michaud, J. Richer
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The Radiative Transfer in Accretion Discs with Linear Plank Function: Role of Scattering Effect [PDF]
Iranian Journal of Astronomy and Astrophysics, 2020 Radiative transfer in a geometrically thin accretion disc with fnite optical depth is considered under the plane-parallel approximation. The Eddington factor that is defned as the ratio of the mean intensity to radiation stress tensor, is assumed be ...
Fahimeh Habibi, Maryam Samadi
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Effects of opacity temperature dependence on radiatively accelerated clouds [PDF]
Monthly Notices of the Royal Astronomical Society, 2020 ABSTRACT We study how different opacity–temperature scalings affect the dynamical evolution of irradiated gas clouds using time-dependent radiation-hydrodynamics simulations. When clouds are optically thick, the bright side heats up and expands, accelerating the cloud via the rocket effect. Clouds that become more optically thick as they
Dyda, Sergei +2 more
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Parallel Implementation of the PHOENIX Generalized Stellar Atmosphere Program [PDF]
, 1996 We describe the parallel implementation of our generalized stellar atmosphere and NLTE radiative transfer computer program PHOENIX. We discuss the parallel algorithms we have developed for radiative transfer, spectral line opacity, and NLTE opacity and ...
Baron E. +5 more
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Opacities and Atomic Diffusion
Galaxies, 2023 Opacity is a fundamental quantity for stellar modeling, and it plays an essential role throughout the life of stars. After gravity drives the collapse of interstellar matter into a protostar, the opacity determines how this matter is structured around ...
Georges Alecian, Morgan Deal
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Radiative Opacity in Stellar Atmospheres. I. Metal Absorption Coefficients
The Astrophysical Journal, 1968 L. Travis, S. Matsushima
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Quantum Molecular Dynamics calculations of radiative opacities [PDF]
Astronomy & Astrophysics, 2003 We show that Quantum Molecular Dynamics provides a powerful tool to extend and benchmark current opacities libraries into the complex regime of warm dense matter. In this regime, the medium can be constituted of electrons, protons, atoms and molecules, while plasma and many-body effects can not be treated as perturbations.
S. Mazevet +4 more
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