A5009610245- Geophysics and Gravity Measurements
- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Geomagnetism and Paleomagnetism Studies
- Planetary Science and Exploration
- Astro and Planetary Science
- GNSS positioning and interference
- Earthquake Detection and Analysis
- Inertial Sensor and Navigation
- Methane Hydrates and Related Phenomena
- Atmospheric Ozone and Climate
- Spacecraft and Cryogenic Technologies
- Spacecraft Design and Technology
- Space Exploration and Technology
- Space exploration and regulation
- Space Satellite Systems and Control
- Meteorological Phenomena and Simulations
- Computational Physics and Python Applications
- Space Science and Extraterrestrial Life
- Gas Dynamics and Kinetic Theory
- Reservoir Engineering and Simulation Methods
- Geological and Geophysical Studies
- Oceanographic and Atmospheric Processes
- Seismic Waves and Analysis
- Atmospheric and Environmental Gas Dynamics
Centre National d'Études Spatiales
2015-2024
Géosciences Environnement Toulouse
2014-2024
Observatoire Midi-Pyrénées
2019-2024
Université de Toulouse
2021-2023
Institut de Recherche pour le Développement
2021-2023
Centre National de la Recherche Scientifique
2021-2023
Université Toulouse III - Paul Sabatier
2023
Japan External Trade Organization
2014-2015
Laboratoire d’Études en Géophysique et Océanographie Spatiales
2007
Goddard Space Flight Center
2006
Precise measurements of the Earth's time‐varying gravitational field from NASA/Deutsches Zentrum für Luft‐ und Raumfahrt Gravity Recovery and Climate Experiment (GRACE) mission allow unprecedented tracking transport mass across underneath surface Earth give insight into secular, seasonal, subseasonal variations in global water supply. Several groups produce these estimates, while various gravity fields are similar, differences processing strategies tuning parameters result solutions with...
Recent observations and model simulations demonstrate unequivocally that non‐Sun‐synchronous (nonmigrating) tides due to deep tropical convection produce large longitudinal local time variations in bulk ionosphere‐thermosphere‐mesosphere properties. We thus stand at an exciting research frontier: understanding how persistent, large‐scale tropospheric weather systems affect the geospace environment. Science challenge questions include: (1) How much of influence is tidal propagation directly...
Densities in the 400–500 km height region inferred from accelerometer measurements on CHAMP and GRACE satellites are utilized to study response isolated severe geomagnetic storm of 20–21 November 2003. The provide data at approximate local times 1110/2310 1430/0230 hours, respectively. In a global sense, density increases order 300–800% occur during this storm, with relatively little time delay high latitudes about 4‐hour equator. Significant latitudinal asymmetries discussed context neutral...
Abstract [1] A major challenge in delineating and understanding the “space weather” of ionosphere-thermosphere system is lack global tidal observations 120–400 km “thermospheric gap” between satellite remote-sensing in-situ diagnostics. This paper aims to close this gap by presenting an observation-based Climatological Tidal Model Thermosphere (CTMT) self-consistent upward propagating migrating nonmigrating diurnal semidiurnal tides from 80–400 pole-to-pole for moderate (F10.7 = 110 sfu)...
Abstract Reprocessed Gravity Field and Steady‐State Ocean Circulation Explorer (GOCE) gravity gradient data were combined with from Laser Geodynamics Satellite (LAGEOS) 1/2 Recovery Climate Experiment (GRACE) to generate a satellite‐only field model degree 260 using the direct approach, named DIR‐R4. When compared Earth Gravitational Model 2008 (EGM2008), it is more accurate at low medium resolution thanks GOCE GRACE data. earlier releases of ESA models, high degrees owing larger amount...
Aims – The Drag Temperature Model (DTM) is a semi-empirical model describing the temperature, density, and composition of Earth's thermosphere. DTM2013 was developed in framework Advanced Thermosphere Modelling Orbit Prediction project (ATMOP). It evaluated compared with DTM2009, pre-ATMOP benchmark, Committe on Space Research (COSPAR) reference for atmospheric drag JB2008.
Abstract Gravity field and steady state Ocean Circulation Explorer (GOCE) gravity gradient data of the entire science mission from LAGEOS 1/2 Recovery Climate Experiment (GRACE) were combined in construction a satellite‐only model to maximum degree 300. When compared Earth Gravitational Model 2008, it is more accurate at low medium resolution, thanks GOCE GRACE data. earlier releases European Space Agency models, high degrees owing larger amount ingested, which was moreover taken lower...
[1] Numerous observations and model studies made during the past 5 years have unequivocally revealed that ionosphere thermosphere owe a considerable amount of their longitudinal, local time, seasonal latitudinal day-to-day variability to waves originating in lower part atmosphere. The most prominent pattern is four-peaked ("wave 4") longitudinal structure frequently observed by (quasi-) Sun-synchronous satellites variety ionospheric thermospheric parameters. "wave 4" has often been...
Abstract The geomagnetic activity index Kp is widely used but restricted by low time resolution (3‐hourly) and an upper limit. To address this, new indices, Hpo, are introduced. Similar to , Hpo expresses the level of planetary in units thirds (0o, 0+, 1−, 1o, 1+, 2−, …) based on magnitude disturbances observed at subauroral observatories. has a higher than . 30‐min (Hp30) 60‐min (Hp60) indices produced. frequency distribution designed be similar that so may as time‐resolution alternative...
Abstract Improving and homogenizing time space reference systems on Earth and, more specifically, realizing the Terrestrial Reference Frame (TRF) with an accuracy of 1 mm a long-term stability 0.1 mm/year are relevant for many scientific societal endeavors. The knowledge TRF is fundamental navigation sciences. For instance, quantifying sea level change strongly depends accurate determination geocenter motion but also positions continental island stations, such as those located at tide...
We present new neutral mass density and crosswind observations for the CHAMP, GRACE, GRACE-FO missions, filling last gaps in our database of accelerometer-derived thermosphere observations. For consistency, we processed data over entire lifetime these noting that results GRACE 2011–2017 are entirely new. All accelerometer newly calibrated. modeled temperature-induced bias variations to counter detrimental effects thermal control deactivation April 2011. Further, developed a radiation...
We report an airborne gravity survey with absolute gravimeter based on atom interferometry and two relative gravimeters: a classical LaCoste\&Romberg (L\&R) novel iMAR strap-down Inertial Measurement Unit (IMU). estimated measurement errors for the quantum ranging from 0.6 to 1.3 mGal depending flight conditions filtering used. Similar are obtained strapdown but long term stability is five times worse. The traditional L\&R platform shows larger (3 - 4 mGal). Airborne measurements have been...
Using densities measured by accelerometers on the CHAMP and GRACE satellites, taking advantage of local time precession characteristics these near‐polar orbiting exosphere temperatures are derived as a function time, longitude latitude. Significant variability (e.g., ±25K maximum to minimum over equator) in geomagnetically‐quiet is shown exist, attributed spectrum diurnal semidiurnal thermal tides that excited troposphere strongly influenced global land‐sea distribution. Since independent...
Abstract Geomagnetic indices are convenient quantities that distill the complicated physics of some region or aspect near‐Earth space into a single parameter. Most best‐known calculated from ground‐based magnetometer data sets, such as Dst, SYM‐H, Kp, AE, AL, and PC. Many models have been created predict values these indices, often using solar wind measurements upstream Earth input variables to calculation. This document reviews current state geomagnetic methods used assess their ability...