Results 51 to 60 of about 786 (162)

Detection of High‐Latitude Magnetic Reconnection Between the Northward Interplanetary Magnetic Field and a Closed Magnetic Field Wedge Linked to a Transpolar Arc

Geophysical Research Letters, Volume 52, Issue 24, 28 December 2025.
Abstract Transpolar arcs (TPAs) describe a subset of auroral emissions observed poleward of the Earth's main auroral ovals when the interplanetary magnetic field (IMF) is northward. These emissions are thought to align with a “wedge” of closed magnetic field lines extending to the high‐latitude boundary of the Earth's magnetosphere, where they are ...
Nawapat Kaweeyanun, Robert C. Fear, Betty S. Lanchester, Daniel K. Whiter, Imogen L. Gingell, Andrew N. Fazakerley, Iannis Dandouras, Stephen B. Mende, Larry J. Paxton   +8 more
wiley   +1 more source

Astrophysique observationnelle (1991-2014)

L’annuaire du Collège de France, 2018
Activite scientifique Depuis l’article fondateur decrivant le principe des hypertelescopes (Labeyrie, 1996), la theorie de leurs proprietes d’imagerie astronomique a haute resolution a ete precisee, et leur mise en œuvre entamee. Les essais d’un hypertelescope prototype dans les Alpes du Sud sont poursuivis sous la direction d’Antoine Labeyrie par l ...
openaire   +1 more source

The Moon's Crust and Upper Mantle Discontinuities Revealed by Seismic Interferometry Methods Applied to Apollo Seismic Data

Journal of Geophysical Research: Planets, Volume 130, Issue 12, December 2025.
Abstract Seismic determination of the Moon's crustal thickness is crucial for understanding its formation, composition, and evolution. Additionally, crustal thicknesses below seismic stations serve as anchoring points for 3D crustal thickness maps derived from gravity and topography field variations.
Arnau Torrent Duch, Raphael F. Garcia, Mélanie Drilleau   +2 more
wiley   +1 more source

Statistical study of foreshock cavitons [PDF]

Annales Geophysicae, 2013
In this work we perform a statistical analysis of 92 foreshock cavitons observed with the Cluster spacecraft 1 during the period 2001–2006. We analyze time intervals during which the spacecraft was located in the Earth's foreshock with durations ...
P. Kajdič, X. Blanco-Cano, N. Omidi, K. Meziane, C. T. Russell, J.-A. Sauvaud, I. Dandouras, B. Lavraud   +7 more
doaj   +1 more source

PROCESSUS D'ACCÉLÉRATION EN ASTROPHYSIQUE

Le Journal de Physique Colloques, 1975
Des observations très diverses mettent en évidence la présence de particules relativistes dans divers objets astronomiques — éruptions solaires, rayonnement cosmique galactique, sources galactiques et extragalactiques de rayonnement synchrotron (restes de supernovae, noyaux de galaxies, quasars, etc.).
openaire   +2 more sources

Abrasion Patch Dehydration Experiment at Bright Angel, Jezero Crater, Using SuperCam Onboard the Mars 2020 Perseverance Rover

Journal of Geophysical Research: Planets, Volume 130, Issue 12, December 2025.
Abstract Investigating the stability of hydrated minerals is integral for examining the preservation of rocks for potential Mars Sample Return and has major implications for models that use rover‐based observations to quantify Mars' global water budget.
S. A. Connell, R. C. Wiens, L. Mandon, C. C. Bedford, S. Siljeström, S. Schröder, G. M. Martínez, Á. Vicente‐Retortillo, E. A. Cloutis, D. M. Applin, A. Broz, C. Royer, J. R. Johnson, J. Van Beek, T. Nelson, E. Clavé, F. Poulet, P. Beck, E. Dehouck, T. Fornaro, T. Fouchet, A. Jones, A. Alberini, A. Cousin, K. Hand, K. Uckert, J. A. Rodríguez‐Manfredi, K. M. Stack, the Mars 2020 team   +28 more
wiley   +1 more source

Spectral Study of Five Major Impact Basins and Their Volcanic Infills on Mercury: A Window Into the Mantle's Properties

Journal of Geophysical Research: Planets, Volume 130, Issue 12, December 2025.
Abstract NASA's MErcury Surface, Space ENvironment, GEochemistry, and Ranging mission has revealed that about 27% of the surface of Mercury is covered by smooth plains, which are mostly volcanic in origin. These plains are mainly located in the northern hemisphere, as well as within and around major impact basins.
E. Caminiti, S. Besse, A. Doressoundiram, J. Wright   +3 more
wiley   +1 more source

Characterization of the Sedimentary Cover in the City of Aïn Témouchent, Northwest Algeria, Using Ambient Noise Measurements

Applied Sciences
The city of Aïn Témouchent, located in northwest Algeria at the westernmost part of the Lower Cheliff Basin, has experienced several moderate earthquakes, the most significant of which occurred on 22 December 1999 (Mw 5.7, 25 fatalities, severe damage ...
Ahmed Saadi, Fethi Semmane, Juan José Galiana-Merino, Abdelkrim Yelles-Chaouche, Abdelouahab Issaadi, Billel Melouk   +5 more
doaj   +1 more source

Solar Orbiter Observations of a Self‐Consistent Ion‐Scale Magnetic Hole at 0.9AU

Geophysical Research Letters, Volume 52, Issue 22, 28 November 2025.
Abstract Magnetic holes (MHs) are localized structures characterized by magnetic field depressions, accompanied by an enhancement in plasma thermal pressure. These pressure‐balanced structures span a broad range of scales in space, from fluid to kinetic regimes. The kinetic‐scale MHs are ubiquitous in the solar wind; however, the exploration is limited
Jing‐Huan Li, Yuri V. Khotyaintsev, Daniel B. Graham, Timothy Horbury, Philippe Louarn   +4 more
wiley   +1 more source

A Novel Neural Network‐Based Approach to Derive a Local Geomagnetic Baseline for Future Robust Characterization of Geomagnetic Indices at Mid‐Latitude

Space Weather
Geomagnetic indices derived from ground magnetic measurements characterize the intensity of solar‐terrestrial interaction. Global magnetic indices derived from multiple magnetic observatories at mid‐latitude have commonly been used for space weather ...
Rungployphan Kieokaew, Veronika Haberle, Aurélie Marchaudon, Pierre‐Louis Blelly, Aude Chambodut   +4 more
doaj   +1 more source