A5055364315- Astro and Planetary Science
- Planetary Science and Exploration
- Solar and Space Plasma Dynamics
- Stellar, planetary, and galactic studies
- Isotope Analysis in Ecology
- Bladder and Urothelial Cancer Treatments
- Epigenetics and DNA Methylation
- Ionosphere and magnetosphere dynamics
- Urinary and Genital Oncology Studies
- Geophysics and Gravity Measurements
- Astronomical and nuclear sciences
- Astrophysics and Star Formation Studies
- Geology and Paleoclimatology Research
- Geomagnetism and Paleomagnetism Studies
- Circular RNAs in diseases
- Spacecraft and Cryogenic Technologies
- MicroRNA in disease regulation
- Nuclear Physics and Applications
- Atmospheric Ozone and Climate
- Cancer Genomics and Diagnostics
- Cancer-related molecular mechanisms research
- Calibration and Measurement Techniques
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Genetic factors in colorectal cancer
Centre National de la Recherche Scientifique
2015-2025
Laboratoire atmosphères, milieux, observations spatiales
2017-2025
Université de Versailles Saint-Quentin-en-Yvelines
2017-2025
Aarhus University
2024
Ministère de l'Intérieur
2022
Helios Kliniken
2021
Aix-Marseille Université
2010-2020
Laboratoire d’Astrophysique de Marseille
2011-2020
Château Gombert
2008-2019
Institut Pierre-Simon Laplace
2017-2019
We report the properties of all 841 coronal mass ejections (CMEs) observed by Solar and Heliospheric Observatory (SOHO) Large Angle Spectroscopic Coronagraph (LASCO) C2 C3 white‐light coronagraphs from January 1996 through June 1998, we compare those to previous observations other similar instruments. Both CME rate distribution apparent locations CMEs varied during this period as expected based on solar cycles. The speeds fraction showing acceleration were also in agreement with earlier...
Images from the OSIRIS scientific imaging system onboard Rosetta show that nucleus of 67P/Churyumov-Gerasimenko consists two lobes connected by a short neck. The has bulk density less than half water. Activity at distance Sun >3 astronomical units is predominantly neck, where jets have been seen consistently. rotates about principal axis momentum. surface morphology suggests removal larger volumes material, possibly via explosive release subsurface pressure or creation overhangs sublimation,...
Critical measurements for understanding accretion and the dust/gas ratio in solar nebula, where planets were forming 4.5 billion years ago, are being obtained by GIADA (Grain Impact Analyser Dust Accumulator) experiment on European Space Agency's Rosetta spacecraft orbiting comet 67P/Churyumov-Gerasimenko. Between 3.6 3.4 astronomical units inbound, OSIRIS (Optical, Spectroscopic, Infrared Remote Imaging System) detected 35 outflowing grains of mass 10(-10) to 10(-7) kilograms, 48 10(-5)...
Images of comet 67P/Churyumov-Gerasimenko acquired by the OSIRIS (Optical, Spectroscopic and Infrared Remote Imaging System) imaging system onboard European Space Agency’s Rosetta spacecraft at scales better than 0.8 meter per pixel show a wide variety different structures textures. The data importance airfall, surface dust transport, mass wasting, insolation weathering for cometary evolution, they offer some support subsurface fluidization models loss through ejection large chunks material.
We analyzed more than 200 OSIRIS NAC images with a pixel scale of 0.9−2.4 m/pixel comet 67P/Churyumov-Gerasimenko (67P) that have been acquired from onboard the Rosetta spacecraft in August and September 2014 using stereo-photogrammetric methods (SPG). derived improved position pointing data for high-resolution shape model consists about 16 million facets (2 m horizontal sampling) typical vertical accuracy at decimeter scale. From this model, we derive volume northern hemisphere 9.35 km3 ±...
Context. The complex shape of comet 67P and its oblique rotation axis cause pronounced seasonal effects. Irradiation hence activity vary strongly.
Context. We investigate the formation and evolution of comet nuclei other trans-Neptunian objects (TNOs) in solar nebula primordial disk prior to giant planet orbit instability foreseen by Nice model.
ABSTRACT The Rosetta probe, orbiting Jupiter-family comet 67P/Churyumov–Gerasimenko, has been detecting individual dust particles of mass larger than 10 −10 kg by means the GIADA collector and OSIRIS Wide Angle Camera Narrow since 2014 August will continue until 2016 September. Detections single allow us to estimate anisotropic flux from 67P, infer loss rate size distribution at surface sunlit nucleus, see whether 67P evolves in time. velocity orbiter, relative is much lower measured GIADA,...
Metis is the first solar coronagraph designed for a space mission capable of performing simultaneous imaging off-limb corona in both visible and UV light. The observations obtained with aboard Solar Orbiter ESA-NASA observatory will enable us to diagnose, unprecedented temporal coverage spatial resolution, structures dynamics full from 1.7 $R_\odot$ about 9 $R_\odot$. Due uniqueness profile, be able observe close vantage point (down 0.28 AU), achieving out-of-ecliptic views increase orbit...
A coronal mass ejection (CME) observed by LASCO exhibits evidence that its magnetic field geometry is of a flux rope. The dynamical properties throughout the fields view C2 and C3 telescopes are examined. results compared with theoretical predictions based on model solar ropes. It shown observations consistent two-dimensional projection three-dimensional rope legs remain connected to Sun.
A spacecraft flyby of an asteroid reveals a high-density body that is more like planetesimal than rubble pile.
Aims. The OSIRIS camera onboard the Rosetta spacecraft has been acquiring images of comet 67P/Churyumov-Gerasimenko (67P)'s nucleus at spatial resolutions down to ~0.17 m/px ever since Aug. 2014. These have yielded unprecedented insight into morphological diversity comet's surface. This paper presents an overview regional morphology 67P.
Context. We present an investigation of the surface properties areas on nucleus comet 67P/Churyumov-Gerasimenko.
Context. The Rosetta mission of the European Space Agency has been orbiting comet 67P/Churyumov-Gerasimenko (67P) since August 2014 and is now in its escort phase. A large complement scientific experiments designed to complete most detailed study a ever attempted are onboard Rosetta.
The Grain Impact Analyzer and Dust Accumulator (GIADA) instrument on board ESA's Rosetta mission is constraining the origin of dust particles detected within coma comet 67 P/Churyumov–Gerasimenko (67P). collected belong to two families: (i) compact (ranging in size from 0.03 1 mm), witnessing presence materials that underwent processing solar nebula (ii) fluffy aggregates 0.2 2.5 mm) sub-micron grains may be a record primitive component, probably linked interstellar dust. dynamics constrain...
We study the link between gravitational slopes and surface morphology on nucleus of comet 67P/Churyumov-Gerasimenko provide constraints mechanical properties cometary material. computed for five regions that are representative different morphologies observed surface, using two shape models from OSIRIS images by stereo-photoclinometry (SPC) stereo-photogrammetry (SPG) techniques. estimated tensile, shear, compressive strengths considerations. The show a similar general pattern in terms...
Abstract. Coronal Mass ejections (CMEs) are enormous eruptions of magnetized plasma expelled from the Sun into interplanetary space, over course hours to days. They can create major disturbances in medium and trigger severe magnetic storms when they collide with Earth's magnetosphere. It is important know their real speed, propagation direction 3-D configuration order accurately predict arrival time at Earth. Using data SECCHI coronagraphs onboard STEREO mission, which was launched October...
We performed a stereo-photogrammetric (SPG) analysis of more than 1500 Rosetta/OSIRIS NAC images comet 67P/Churyumov-Gerasimenko (67P). The with pixel scales in the range 0.2−3.0 m/pixel were acquired between August 2014 and February 2016. finally derived global high-resolution 3D description 67P's surface, SPG SHAP7 shape model. It consists about 44 million facets (1−1.5 m horizontal sampling) typical vertical accuracy at decimeter scale. Although some taken after perihelion, model can be...