Results 71 to 80 of about 61,701 (212)
Astronomische Nachrichten, Volume 346, Issue 9, November 2025.ABSTRACT We present James Webb Space Telescope observations of M 4—the closest globular cluster—that probe the lower Main Sequence down to the hydrogen‐burning limit. The unveiled stellar sequence reaches much fainter luminosities than previously possible, revealing a few extremely red objects that are consistent with brown dwarfs as cool as Teff∼1000K$
L. R. Bedin +10 more
wiley +1 more source
A simple laser-based device for simultaneous microbial culture and absorbance measurement [PDF]
, 2012 In this work we present a device specifically designed to study microbial growth with several applications related to environmental microbiology and other areas of research as astrobiology.
Abrevaya, Ximena Celeste +3 more
core +3 more sources
Earth and Space Science, Volume 12, Issue 11, November 2025.Abstract This work examines atmospheric effects on cosmic ray counts observed by a Water‐Cherenkov detector at the Argentine Antarctic Marambio Station. We analyze the influence of ground‐level barometric pressure and geopotential height at various pressure levels on daily particle rates, finding the strongest association at 100 hPa, linked to ...
N. A. Santos +7 more
wiley +1 more source
Estimating the mass of CMEs from the analysis of EUV dimmings [PDF]
, 2019 Context. Reliable estimates of the mass of coronal mass ejections (CMEs) are required to quantify their energy and predict how they affect space weather.
Balmaceda, Laura Antonia +4 more
core +1 more source
Revista Latino-Americana de Educação em Astronomia, 2020 O presente artigo é um recorte de uma pesquisa mais ampla, desenvolvida no decorrer do curso de extensão em Astronomia “Diário do Céu – Introdução à Astronomia para Professores da Educação Básica”.
A. Prado, R. Nardi
semanticscholar +1 more source
Journal of Geophysical Research: Space Physics, Volume 130, Issue 11, November 2025.Abstract A geomagnetic superstorm occurred from May 10 to 12, 2024, producing significant spatial and temporal disturbances in the ionosphere. Ground‐based ionosonde and GPS‐TEC data enabled the identification, analysis, and possible interpretation of a unique event: the simultaneous occurrence of Spread‐F and multiple F‐layer stratifications during ...
P. R. Fagundes +9 more
wiley +1 more source
Coherence-length effects in fast atom diffraction at grazing incidence [PDF]
, 2018 Coherence properties of projectiles, found relevant in ion-atom collisions, are investigated by analyzing the influence of the degree of coherence of the atomic beam on interference patterns produced by grazing-incidence fast-atom diffraction (GIFAD or ...
Frisco, Leandro +2 more
core +1 more source
A new method to find the potential center of N-body systems [PDF]
, 2002 We present a new and fast method to nd the potential center of an N-body distribution. The method uses an iterative algorithm which exploits the fact that the gradient of the potential is null at its center: it uses a smoothing radius to avoid getting
Aguilar, L. A. +2 more
core +1 more source
Mapping Geothermal Fluids Using Seismic Absorption and Scattering: A Case Study From Aluto Volcano
Geophysical Research Letters, Volume 52, Issue 19, 16 October 2025.Abstract Seismic attenuation tomography is used to map fluids and fractures beneath the Aluto volcano geothermal field of the Main Ethiopian Rift. We present 3D models of peak delay (Δlog10Tpd ${\Delta }{\log }_{10}\left({T}_{pd}\right)$) and inverse coda quality factor (Qc−1 ${Q}_{c}^{-1}$) which are proxies for seismic scattering and absorption. High
Tesfahiwet Yemane +3 more
wiley +1 more source