Results 31 to 40 of about 927 (171)

Stark broadening parameter tables for K VIII and K IX [PDF]

Serbian Astronomical Journal, 1998
Using a semiclassical approach, we have calculated electron−, proton−, and He III−impact line widths and shifts for 4 K VIII and 30 K IX multiplets as a function of temperature and perturber density.
Dimitrijević M.S., Sahal−Bréchot S.
doaj   +1 more source

Reanalysis of SKR Source Crossed by Cassini: Loss Cone Electrons as a Secondary Source of Free Energy

Geophysical Research Letters, Volume 53, Issue 16, 28 August 2026.
Abstract Saturn's Kilometric Radiation (SKR) is a powerful non‐thermal radio auroral emission produced by the Cyclotron Maser Instability (CMI), which generates waves close to the local cyclotron frequency in a highly magnetized plasma from mildly relativistic electrons.
B. Collet, L. Lamy, Y. Kasaba, N. Andre
wiley   +1 more source

Stark broadening parameter tables for Sc X, Sc XI, Ti XI and Ti XII [PDF]

Serbian Astronomical Journal, 1998
By using the semiclassical-perturbation formalism, we have calculated electron-, proton-, and He III-impact line widths and shifts for 4 Sc X, 10 Sc XI, 4 Ti XI and 27 Ti XII multiplets, significant for investigation and modeling of different ...
Dimitrijević M.S., Sahal−Bréchot S.
doaj   +1 more source

Interférométrie optique et observations astrophysiques [PDF]

Photoniques, 2012
Depuis la fin des annees 90, les astronomes utilisent l’interferometrie de maniere reguliere comme outil d’observation pour depasser la limite de resolution des plus grands telescopes actuels. Apres une periode de validation au moyen de premiers prototypes de reseaux de telescopes, l’effort est porte maintenant sur l’optimisation de l’instrumentation ...
Pierre Kern, Jean-Baptiste Le Bouquin
openaire   +1 more source

Structured Energy Conversion in Kelvin‐Helmholtz Instability

Geophysical Research Letters, Volume 53, Issue 15, 16 August 2026.
Abstract We present quantitative investigations of the energy conversion pathways—electromagnetic ϵEM $\left({{\epsilon}}^{EM}\right)$, fluid flow ϵf $\left({{\epsilon}}^{f}\right)$, and particle thermal ϵth $\left({{\epsilon}}^{th}\right)$ energies—within the Kelvin‐Helmholtz instability (KHI) observed by the Magnetospheric Multiscale mission. We find
Kyunghwan Dokgo, Kyoung‐Joo Hwang, Eunjin Choi, James L. Burch, Rungployphan Kieokaew   +4 more
wiley   +1 more source

Stark broadening parameter tables for neutral calcium spectral lines. I [PDF]

Serbian Astronomical Journal, 1999
Using a semiclassical approach, we have calculated electron−, proton−, He II−, Mg II-, Si II- and Fe II-impact line widths and shifts for 189 Ca I multiplets as a function of temperature.
Dimitrijević M.S., Sahal−Bréchot S.
doaj   +1 more source

Bidirectional Energy Transfer via Simultaneous Wave‐Particle Resonances in Inhomogeneous Space Plasmas

AGU Advances, Volume 7, Issue 4, August 2026.
Abstract Wave‐particle resonance is a key mechanism for energy transfer in collisionless plasmas with important implications for wave excitation and particle acceleration. Cyclotron resonance occurs when a particle's gyromotion synchronizes with the wave fields, with their interactions usually describable by quasilinear diffusion or nonlinear trapping.
Jing‐Huan Li, Xu‐Zhi Zhou, Shan Wang, Zhi‐Yang Liu, Yuri V. Khotyaintsev, Daniel B. Graham, Qiu‐Gang Zong, Chao Yue, Anton V. Artemyev, Yoshiharu Omura, Si Liu, Li Li, Jie Ren, Zi‐Kang Xie, Yun Yan   +14 more
wiley   +1 more source

Simulation-based inference with neural posterior estimation applied to X-ray spectral fitting

Astronomy & Astrophysics
Context. Simulation-based inference with neural posterior estimation can be used for X-ray spectral fitting both in the Gaussian and Poisson regimes, enabling users to rapidly derive approximated posteriors of the model parameters. Aims.
Barret Didier, Dupourqué Simon
doaj   +1 more source

PHYSIQUE NUCLÉAIRE ET ASTROPHYSIQUE

Le Journal de Physique Colloques, 1975
La physique nucléaire des hautes et moyennes énergies peut être considérée comme un moyen d'investigation puissant du rayonnement cosmique galactique. Les noyaux du rayonnement cosmique sont en effet transformés tout au long de leur parcours dans les sources et le milieu interstellaire par réactions nucléaires de spallation ou (et) décroissance ...
openaire   +2 more sources

LIBS Elemental Mapping of a Feldspathic Lunar Meteorite: Insights for In Situ Exploration

Journal of Geophysical Research: Planets, Volume 131, Issue 7, July 2026.
Abstract To meet the objectives of the many robotic and human missions planned for the Moon in the coming decade, new scientific instruments are currently under development. Laser‐induced breakdown spectroscopy (LIBS) is a robust technique for quantifying elemental abundances by focusing a pulsed laser to generate a plasma and collecting its emission ...
H. T. Manelski, C. Bedford, Dong Jae Lee, R. C. Wiens, J. Gillis, H. Vannier, A. Klidaras, B. L. Jolliff, A. Ollila, S. Clegg, F. Mourlin, W. Rapin, A. Fraeman   +12 more
wiley   +1 more source