A5076566316- Earthquake Detection and Analysis
- Ionosphere and magnetosphere dynamics
- Seismic Waves and Analysis
- Lightning and Electromagnetic Phenomena
- Meteorological Phenomena and Simulations
- Geophysics and Gravity Measurements
- Seismology and Earthquake Studies
- Solar and Space Plasma Dynamics
- Underwater Acoustics Research
- Atmospheric aerosols and clouds
- Atmospheric Ozone and Climate
- Geophysical Methods and Applications
- Geomagnetism and Paleomagnetism Studies
- Atmospheric and Environmental Gas Dynamics
- Seismic Imaging and Inversion Techniques
- Planetary Science and Exploration
- Astro and Planetary Science
- Tropical and Extratropical Cyclones Research
- Geophysics and Sensor Technology
- GNSS positioning and interference
- High voltage insulation and dielectric phenomena
- Spacecraft Design and Technology
- Climate variability and models
- Wind and Air Flow Studies
- Methane Hydrates and Related Phenomena
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2011-2022
Centre d'études de l'emploi
2022
CEA DAM Île-de-France
2010-2019
Centre National de la Recherche Scientifique
2009
Université d'Orléans
2009
Laboratoire de Glaciologie et Géophysique de l’Environnement
2001
Université Toulouse III - Paul Sabatier
1978
The Atmosphere-Space Interactions Monitor (ASIM) is an instrument suite on the International Space Station (ISS) for measurements of lightning, Transient Luminous Events (TLEs) and Terrestrial Gamma-ray Flashes (TGFs). Developed in framework European Agency (ESA), it was launched April 2, 2018 SpaceX CRS-14 flight to ISS. ASIM mounted external platform ESA's Columbus module eleven days later planned take during minimum 3 years.
Abstract High‐resolution, ground‐based and independent observations including co‐located wind radiometer, lidar stations, infrasound instruments are used to evaluate the accuracy of general circulation models data‐constrained assimilation systems in middle atmosphere at northern hemisphere midlatitudes. Systematic comparisons between observations, European Centre for Medium‐Range Weather Forecasts (ECMWF) operational analyses recent Integrated Forecast System cycles 38r1 38r2, NASA's...
The paper reviews recent advances in studies of electric discharges the stratosphere and mesosphere above thunderstorms, their effects on atmosphere. primary focus is sprite discharge occurring mesosphere, which most commonly observed high altitude by imaging cameras from ground, but upper atmosphere electromagnetic radiation lightning are also considered. During past few years, co-ordinated observations over Southern Europe have been made a wide range parameters related to sprites causative...
A global‐scale analysis of detections made at all 36 currently operating International Monitoring System (IMS) infrasound arrays confirms that the primary factor controlling signal detectability is seasonal variability stratospheric zonal wind. At most arrays, ∼80% in 0.2‐ to 2‐Hz bandpass are associated with propagation downwind dominant wind direction. Previous IMS network performance models neglect time‐ and site‐dependent effects both meteorological ambient noise models. In this study...
This paper reviews recent progress toward understanding the dynamics of middle atmosphere in framework Atmospheric Dynamics Research InfraStructure Europe (ARISE) initiative. The atmosphere, integrating stratosphere and mesosphere, is a crucial region which influences tropospheric weather climate. Enhancing requires improved measurement propagation breaking planetary gravity waves originating lowest levels atmosphere. Inter-comparison studies have shown large discrepancies between...
Active volcanoes in the Vanuatu archipelago permanently generate infrasonic waves. Their monitoring over 1 year exhibits clear seasonal trends direction of arrival detected signals. From summer to winter azimuth variation reaches 15°. This deviation is essentially due reversibility zonal stratospheric wind with season which strongly affects deflection ray direction. A three‐dimensional (3‐D) ray‐tracing modeling roughly explains observed trend but underestimates its amplitude. The...
Propagation modeling based on existing semiempirical atmospheric models roughly explains seasonal changes in infrasonic observables but underestimates their fluctuations. The discrepancies between observations and predictions are probably due to the lack of precision available upper wind models. Here we propose a continuous infrasound monitoring active volcanoes as remote sensing method atmosphere. A refined inversion procedure has been developed for adjusting vertical structure stratosphere...
Research about thunder was mainly performed 20–30 years ago but has been renewed in recent due to new interest infrasound the framework of verification compliance Comprehensive Nuclear‐Test‐Ban Treaty. During Eurosprite 2005 campaign, an miniarray set up France measure characteristics from lightning and sprites when these kinds sources were close sensors (that is, for distances lower than 100 km sprite 300 km). For two large thunderstorms which passed over station, detection conditions are...
Abstract A new study of gravity waves produced by thunderstorms was performed using continuous recordings at the IS17 (Ivory Coast) infrasound station International Monitoring System developed for verification Comprehensive Nuclear Test‐Ban Treaty. typical case is presented a large thunderstorm on 10–11 April 2006 lasting near 14 h. Comparison with cloud temperature measured Meteosat 6 satellite shows that wave activity when low inside convection cells located over station. Statistics based...
Since 1960, several experiments have shown strong perturbations of the ionosphere after earthquakes. For biggest quakes, Doppler ionospheric soundings revealed displacements tens meter ionized layers E and F. An accurate modelling these phenomena was however never described. We present here synthetic such oscillations compare it with experimental data. Realistic models atmosphere including viscosity are used, as well realistic Earth seismic source model. These computed by normal modes...
Abstract In this paper, we evaluate vertical wind and temperature profiles that are produced by the European Centre for Medium‐Range Weather Forecasts (ECMWF) atmospheric analysis. The evaluation is carried out on both hemispheres: make use of stratospheric infrasound arrivals from Mount Etna (37°N) Yasur (22°S). near‐continuous, high activity volcanoes permits study propagation along well‐defined paths with a time resolution ranging hours to multiple years. Infrasound observables compared...
Results are presented from the first European campaign for observation of sprites, conducted during summer 2000 French astronomical observatory, Observatoire Midi‐Pyrénées. The primary objective was to establish if sprites generated over Europe and identify characteristics associated thunderstorms. During one‐month local weather conditions allowed observations approximately half nights. Sprites were observed two nights Alps one night southeastern France in connection with cold fronts moving...
Infrasonic signals generated by daily supersonic Concorde flights between North America and Europe have been consistently recorded an array of microbarographs in France. These are used to investigate the effects atmospheric variability on long-range sound propagation. Statistical analysis wave parameters shows seasonal variations associated with changes wind structure atmosphere. The measurements compared predictions obtained tracing rays through realistic models. Theoretical ray paths allow...
The experiment LSO (Lightning and Sprite Observations) is dedicated to the optical study, from International Space Station, of sprites occurring in upper atmosphere above thunderstorms. objectives were study these phenomena validate a new measurement concept for future measurements space at nadir. first performed frame flight French Astronaut Claudie Haigneré (mission Andromède) October 2001. Observations by two microcameras, one visible near‐infrared other equipped with moderately wide band...
During the summer of 2003, complementary measurements were taken in Europe during Sprite2003 campaign to study sprites and associated processes. On July 21, 28 observed by light‐sensitive optical cameras located at Observatoire du Pic Midi Pyrenees mountains found correlate with chirp‐like signals several tenth few minutes duration, measured an infrasound station Flers about 400 km from thunderstorm. The sprite activity identified signature continued past sunrise into daytime when systems...
The International Monitoring System (IMS) of the Comprehensive Nuclear-Test-Ban Treaty (CTBT) continuously records acoustic waves in 0.01-10 Hz frequency band, known as infrasound. These propagate through layered structure atmosphere. Coherent infrasonic are produced by a variety anthropogenic and natural sources their propagation is controlled spatiotemporal variations temperature wind velocity. Natural stratification atmospheric properties (e.g. temperature, density winds) forms...
Very recently NASA astronauts took a new set of pictures from the International Space Station during night time in frame Crew Earth Observations program, giving opportunity to observe color sprites and their parent lightning flashes. During about 20 h observations, nondirectly dedicated thunderstorm studies, 15 were observed August 2011 April 2012. Chromatic observations allow analyzing thoroughly main components sprite radiation. The red green emissions, all images, are due radiation first...