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We model the correlated X-ray - UV observations of NGC 7469, for which well sampled data in both these bands have been obtained recently in a multiwavelength monitoring campaign. To this end we derive the transfer function in wavelength \ls…

Astrophysics · Physics 2009-10-31 Andrew J. Berkley , Demosthenes Kazanas , Jonathan Ozik

Understanding the initiation of solar flares and coronal mass ejections (CMEs) is essential for improving forecasts of extreme space weather. Soft X-ray (SXR) and Extreme Ultraviolet (EUV) observations provide critical diagnostics of the…

In situ exploration of the planetary atmospheres requires the development of laboratory experiments to understand the molecular growth pathways initiated by photochemistry in the upper layers of the atmospheres. Major species and dominant…

The AIRES (AIR-shower Extended Simulations) system is a set of programs and subroutines to realistically simulate particle showers produced after the incidence of high energy cosmic rays on the Earth's atmosphere, and to manage all the…

Astrophysics · Physics 2019-07-12 S. J. Sciutto

Computed color indices and spectral shapes for individual stars are routinely compared with observations for essentially all spectral types, but absolute fluxes are rarely tested. We can confront observed irradiances with the predictions…

Astrophysics · Physics 2007-09-17 Carlos Allende Prieto

The EXO-UV program is an international, interdisciplinary collaboration between astrophysicists and biologists aimed at expanding the characterization of ultraviolet radiation (UVR) environments on exoplanets. This approach combines…

We simulate convection near the solar surface, where the continuum optical depth is of order unity. Hence, to determine the radiative heating and cooling in the energy conservation equation, we must solve the radiative transfer equation…

Astrophysics · Physics 2007-05-23 Robert Stein , Aake Nordlund

Ellerman bombs (EBs) and UV bursts are both small-scale solar activities that occur in active regions. They are now believed to form at different heights in the lower atmosphere. In this paper, we use one-dimensional radiative hydrodynamic…

Solar and Stellar Astrophysics · Physics 2021-11-09 Jie Hong , Ying Li , M. D. Ding , Qi Hao

Context: The current distribution of planet mass vs. incident stellar X-ray flux supports the idea that photoevaporation of the atmosphere may take place in close-in planets. Integrated effects have to be accounted for. A proper calculation…

Earth and Planetary Astrophysics · Physics 2015-05-28 J. Sanz-Forcada , G. Micela , I. Ribas , A. M. T. Pollock , C. Eiroa , A. Velasco , E. Solano , D. Garcia-Alvarez

A large fraction of stars form within young embedded clusters, and these environments produce a substantial ultraviolet (UV) background radiation field, which can provide feedback on the star formation process. To assess the possible…

Astrophysics · Physics 2009-11-13 M. Fatuzzo , F. C. Adams

The paper discusses some 3D simulations to compute the ionizing radiation dose during laser-plasma experiments leading to the generation of accelerated protons and electrons. Also, we suggest a new method to increase the measurement…

Instrumentation and Detectors · Physics 2019-10-02 M. Ganciu , A. Chirosca , A. Groza , E. Stancu , O. Stoican , D. B. Dreghici , B. Butoi , C. Ticos , B. Mihalcea , B. Cramariuc

In astrophysics, the search for sources of the highest-energy cosmic rays continues. For further progress, not only ever better observatories but also ever more realistic numerical simulations are needed. We compare different approaches for…

High Energy Astrophysical Phenomena · Physics 2023-03-01 P. Reichherzer , J. Becker Tjus

Numerical simulation is a powerful tool for assessing the causes of an Urban Heat Island (UHI) effect or quantifying the impact of mitigation solutions on outdoor and indoor thermal comfort. For that purpose, several models have been…

Computational Engineering, Finance, and Science · Computer Science 2025-04-03 Marie-Hélène Azam , Julien Berger , Edouard Walther , Sihem Guernouti

There is an ongoing and future experimental program searching for axions as both extensions of the Standard Model and as candidates for the observed dark matter. In this paper, we examine the feasibility of being able to pin down precise…

High Energy Physics - Phenomenology · Physics 2025-04-11 Jacob M. Leedom , Serah Moldovsky , Hitoshi Murayama

The SPEAR (or 'FIMS') instrumentation has been used to conduct the first large-scale spectral mapping of diffuse cosmic far ultraviolet (FUV, 900-1750 AA) emission, including important diagnostics of interstellar hot (10^4 K - 10^6 K) and…

Solar shading design should be done for the desired Indoor Environmental Quality (IEQ) in the early design stages. This field can be very challenging and time-consuming also requires experts, sophisticated software, and a large amount of…

Machine Learning · Computer Science 2022-01-11 Maryam Daneshi , Reza Taghavi Fard , Zahra Sadat Zomorodian , Mohammad Tahsildoost

Foundation models have demonstrated remarkable success across various scientific domains, motivating our exploration of their potential in solar physics. In this paper, we present Solaris, the first foundation model for forecasting the…

Solar and Stellar Astrophysics · Physics 2024-11-26 Harris Abdul Majid , Pietro Sittoni , Francesco Tudisco

In this report, the implementation of a program for the simulation of the sky map, in the gamma rays energy range, observed by the GLAST experiment will be described. The program generates a list of photons and images of the galactic and…

Astrophysics · Physics 2007-05-23 C. Cecchi , F. Marcucci , M. Pepe , G. Tosti

Surface solar irradiance varies on scales as small as seconds or meters due to scattering and absorption by the atmosphere. Clouds are the main driver of this variability, but moisture structures in the atmospheric boundary layer and…

Atmospheric and Oceanic Physics · Physics 2024-04-08 Wouter Mol , Bert Heusinkveld , Mary Rose Mangan , Oscar Hartogensis , Menno Veerman , Chiel van Heerwaarden

We present magnetohydrodynamic simulations of star formation in the multiphase interstellar medium to quantify the impact of non-ionising far-ultraviolet (FUV) radiation within the \textsc{Silcc Project} simulation framework. Our study…

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