Results 21 to 30 of about 34,048 (260)

Pseudo-Relativistic Hartree–Fock and Fully Relativistic Dirac–Hartree–Fock Calculations of Radiative Parameters in the Fifth Spectrum of Lutetium (Lu V)

open access: yesAtoms, 2022
Using two independent theoretical methods based on the pseudo-relativistic Hartree–Fock (HFR) and the fully relativistic Multiconfigurational Dirac–Hartree–Fock (MCDHF) approaches, we computed the radiative parameters (transition probabilities and ...
Lucas Maison   +2 more
doaj   +1 more source

The Inhomogeneity Effect. III. Weather Impacts on the Heat Flow of Hot Jupiters

open access: yesThe Astrophysical Journal, 2023
The interior flux of a giant planet impacts atmospheric motion, and the atmosphere dictates the interior’s cooling. Here we use a non-hydrostatic general circulation model (Simulating Non-hydrostatic Atmospheres on Planets) coupled with a multi-stream ...
Xi Zhang   +3 more
doaj   +1 more source

Ideas and Tools for Error Detection in Opacity Databases

open access: yesAtoms, 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
doaj   +1 more source

Adaptive Algorithm for the Generation of Superconfigurations in Hot-Plasma Opacity Calculations

open access: yesPlasma, 2022
In hot plasmas, such as the ones encountered in astrophysics or laser-fusion studies, the number of ionic excited states may become huge, and the relevant electron configurations cannot always be handled individually.
Jean-Christophe Pain
doaj   +1 more source

How Well do We Understand the Planck Feedback?

open access: yesJournal 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
doaj   +1 more source

The link between outgoing longwave radiation and the altitude at which a spaceborne lidar beam is fully attenuated [PDF]

open access: yesAtmospheric 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
doaj   +1 more source

The Radiative Transfer in Accretion Discs with Linear Plank Function: Role of Scattering Effect [PDF]

open access: yesIranian 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
doaj   +1 more source

Opacities and Atomic Diffusion

open access: yesGalaxies, 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
doaj   +1 more source

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