Joint Europa Mission (JEM): a multi-scale study of Europa to characterize its habitability and search for extant life
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status: published
Étude du comportement physico-chimique et électrique de polymères spatiaux sous irradiation de haute énergie
En environnement spatial, les satellites doivent faire face à des radiations de particules énergétiques (électrons, ions) de forte intensité, pouvant conduire à une accumulation de charges électriques sur les dispositifs et isolants. L’implantation de ces charges au sein des matériaux, peut initier l’amorçage de décharges électrostatiques et d’arcs...
Study of internal charging of four commonly used polymers through experimental and numerical analysis
This paper focuses on the study of internal charging of four space used polymers: polyetheretherketone, fluorinated ethylene propylene, polyimide films, and epoxy based material (Epoxy FR4). Experiments were carried out for each material using the GEODUR facility (Toulouse, ONERA) that mimics the geostationary space environment behind shielding. Tw...
Cathodoluminescence of aluminum ceramic compounds
We compare in this study the differences in cathodoluminescence spectra of aluminum-based materials. AlN and Al2O3 materials respond differently when subjected to 10 keV charging electron beam. In order to understand the underlying physics, we carried out a parametric study (annealing treatment, temperature, radiation dose, and supplier). Tests hav...
Étude et modélisation numérique de l’effet des radiations spatiales sur l’évolution des propriétés physiques et électriq...
Les diélectriques, et plus particulièrement les polymères, sont fréquemment utilisés à bord des satellites pour leurs bonnes propriétés physiques, optiques et mécaniques. Ces matériaux, tels que le Téflon® FEP ou le Kapton® HN, sont soumis à d’importants flux radiatifs, d’électrons et de protons, aux énergies variées. Ces particules s’implantent da...
Results from one year of Ka-band beacon measurements at Svalbard
Since April 1, 2016, a Ka-band (20.198 GHz) propagation terminal has been installed and operating at the Svalsat facility in Longyearbyen, Norway. This campaign is a joint effort between the European Space Agency (ESA), Kongsberg Satellite Services (KSAT), the French Aerospace Laboratory (ONERA), the Centre National d'Etudes Spatiales (CNES), and N...
Cassini CAPS identification of pickup ion compositions at Rhea
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Saturn's largest icy moon, Rhea, hosts a tenuous surface‐sputtered exosphere composed primarily of molecular oxygen and carbon dioxide. In this Letter, we examine Cassini Plasma Spectrometer velocity space distributions near Rhea and confirm that Cassini detected nongyrotropic fluxes of outflowing urn:x-wiley:grl:media:grl56939:grl56939-math-0001 d...
1-D Physical Model of Charge Distribution and Transport in Dielectric Materials Under Space Radiations
In this paper, the development of a 1-D physical and numerical model is presented for the description of charge transport and ionization processes of irradiated space used polymers (Teflon FEP and Kapton HN). This model extends the previous circuit model described by Hanna et al. and relies on solid-state physics. This model aims at predicting the ...
Phase relations between the water-rich sulfuric acid hydrates, potential markers of thermal history on Jupiter’s icy moo...
Synchrotron X-ray powder diffraction has been used to explore the water-rich (
90° Rotation of orbital stripes in bilayer manganite PrCa2Mn2O7 studied by in situ transmission electron microscopy
We present an in situ transmission electron microscopy study on the half-doped bilayer manganite PrCa2Mn2O7 to reveal the rotation process of the orbital stripes. Between the reported initial and final ordering phases, we identified an intermediate state with two sets of satellite spots to bridge the 90° rotation of the orbital stripes. Furthermore...
