Results 41 to 50 of about 786 (162)
Characterizing Martian Primary Crustal Compositions With Gamma Ray Spectroscopy
Geophysical Research Letters, Volume 53, Issue 2, 28 January 2026.Abstract Mars's global‐scale chemical maps of the midlatitudes, derived from Mars Odyssey gamma and neutron spectroscopy, have constrained martian geology across a multitude of processes. However, the chemical maps are often used to analyze pre‐defined regions based on mapped geology and/or mineralogy.
Carlos E. Gary‐Bicas +5 more
wiley +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
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Geophysical Research Letters, Volume 53, Issue 1, 16 January 2026.Abstract The magnetic reconnection rate at the magnetopause is crucial for solar wind and magnetosphere coupling. However, direct measurement is challenging due to inherent uncertainties and limited electron diffusion region statistics, hindering understanding of the guide field's influence on the normalized reconnection rate.
B. Michotte de Welle +8 more
wiley +1 more source
Frontiers in Astronomy and Space Sciences, 2021 The properties of the solar wind fraction that exhibits an Interplanetary Magnetic Field (IMF) orientation orthogonal to the classical Parker spiral (so-called ortho-Parker) are investigated.
V. Génot, B. Lavraud, B. Lavraud
doaj +1 more source
Le rayonnement thermique en astrophysique [PDF]
Photoniques, 2020 Le rayonnement thermique est une source décisive d’informations pour une science de l’observation comme l’astrophysique. Dominant dans l’infrarouge lointain, il est difficile à mesurer, et nécessite le développement de détecteurs innovants et de techniques cryogéniques de pointe. Mise en œuvre à bord de satellite depuis 40 ans, la mesure du rayonnement
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Journal of Geophysical Research: Planets, Volume 131, Issue 1, January 2026.Abstract Martian carbonate‐bearing rocks are compelling targets for exploration because they preserve detailed records of past aqueous processes, climate, and habitability. The Margin unit in Jezero crater is a distinct olivine‐ and carbonate‐bearing unit stratigraphically underlying the western fan, lining the inner margin of the western crater rim ...
Alexander J. Jones +29 more
wiley +1 more source
In-flight calibration of the Hot Ion Analyser on board Cluster [PDF]
Geoscientific Instrumentation, Methods and Data Systems, 2014 The Hot Ion Analyser (HIA), part of the Cluster Ion Spectrometry experiment, has the objective to measure the three-dimensional velocity distributions of ions. Due to a variety of factors (exposure to radiation, detector fatigue and aging, changes in the
A. Blagau +5 more
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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 ...
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“Astrophysique sur Mesure”, E-learning in Astronomy and Astrophysics [PDF]
Proceedings of the International Astronomical Union, 2009 Abstract“Astrophysique sur Mesure” (astrophysics made-to-measure) is a set of e-learning programmes started 4 years ago at the Paris Observatory. In order to deliver attractive and efficient programmes, we have added many multimedia tools to usual lectures: animations, Java applets. The programmes are presented on two different platforms. The first one
Mosser, Benoît +4 more
openaire +2 more sources
A Fluvio‐Lacustrine Environment Preserved in the Jezero Crater Inlet Channel, Neretva Vallis, Mars
Journal of Geophysical Research: Planets, Volume 131, Issue 1, January 2026.Abstract Martian fluvial valleys provide evidence for the surface flow of liquid water, making them a key target for rover‐based investigations of ancient habitability. The Mars 2020 Perseverance rover spent ∼85 sols exploring the Bright Angel formation, exposed across the floor of Neretva Vallis: the western inlet channel of Jezero crater.
Alexander J. Jones +31 more
wiley +1 more source