A5018365446- Astro and Planetary Science
- Planetary Science and Exploration
- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Geomagnetism and Paleomagnetism Studies
- Earthquake Detection and Analysis
- Seismic Waves and Analysis
- Space Exploration and Technology
- Geophysics and Gravity Measurements
- earthquake and tectonic studies
- Space Satellite Systems and Control
- GNSS positioning and interference
- Stellar, planetary, and galactic studies
- Seismology and Earthquake Studies
- Atmospheric Ozone and Climate
- Gamma-ray bursts and supernovae
- Atomic and Subatomic Physics Research
- Astronomical Observations and Instrumentation
- Radio Astronomy Observations and Technology
- Historical Astronomy and Related Studies
- Spacecraft Design and Technology
- High-pressure geophysics and materials
- Magnetic confinement fusion research
- Astrophysics and Cosmic Phenomena
- Spacecraft and Cryogenic Technologies
Laboratoire atmosphères, milieux, observations spatiales
2015-2024
Université de Versailles Saint-Quentin-en-Yvelines
2009-2024
Centre National de la Recherche Scientifique
2011-2024
Université Paris-Saclay
2021-2024
Sorbonne Université
2021-2024
Helios Kliniken
2009-2021
Institut Pierre-Simon Laplace
1999-2016
Ecologie des Forêts de Guyane
1996-2007
Austrian Academy of Sciences
2005
University of Iowa
2004
We report data from the Cassini radio and plasma wave instrument during approach first orbit at Saturn. During approach, emissions Saturn showed that rotation period is now 10 hours 45 minutes +/- 36 seconds, about 6 longer than measured by Voyager in 1980 to 1981. In addition, many intense impulsive signals were detected lightning orbit. Some of these have been linked storm systems observed imaging instrument. Within magnetosphere, whistler-mode auroral hiss near rings, suggesting a strong...
The Unified Radio and Plasma Wave (URAP) experiment on the interplanetary spacecraft Ulysses is able to detect Saturnian kilometric radiation (SKR) thanks high sensitivity of receiver in spite remoteness planet (8–13 AU). Our knowledge about Saturn comes essentially from observations by two Voyager spacecraft. allows us reassess main properties SKR as they had been observed 1 2: average flux density, spectrum, periodicity, polarization. A striking difference between results obtained those...
A new determination of the location Saturn's kilometric radiation (SKR) sources is deduced from a limited set hypotheses: assuming that radio are fixed in latitude and local time, SKR emitted on X mode near its cutoff frequency, we obtain source footprints for northern southern sources. The both hemispheres appear magnetically conjugate consistent over whole frequency range. They centered about 1300 time (LT), at magnetic latitudes ≥80°, extending toward lower morning side (down to 60°...
We study the sub-ionospheric VLF transmitter signals recorded by Austrian Graz station in year 2020. Those radio are known to propagate Earth-ionosphere waveguide between ground and lower ionosphere. The facility (geographic coordinates: 15.46°E, 47.03°N) can receive such signals, particularly those propagating above earthquake (EQ) regions southern part of Europe. consider this work amplitude variations a few weeks before occurrence two EQs Croatia at distance less than 200 km from...
Electric field amplitude and phase measurements between narrowband VLF/LF transmitters receivers in the sub-ionospheric waveguide are affected altered by man-made natural sources (Nina 2024; Boudjada et al., 2024a,b). In this study we investigate Mw≥5.0 earthquakes (EQs) which occurred Europe during year 2024 based on data from INFREP receiver network (Biagi 2019; Moldovan 2015; Galopeau 2023). selected Mediterranean area with geographical longitude [-10°E, 40°E]...
We analyze the electric field measurements recorded by radio and plasma wave experiment (RPWS) onboard Cassini spacecraft. This mission has been designed to study mostly waves emissions in environment of Saturn (Galopeau et al., 2007). RPWS instrument allowed investigate Saturnian magnetosphere its vicinity over a frequency range from 1 Hz 16 MHz. RWPS dynamic spectra displayed Type II intensity variation (in dB) versus kHz) observation time UT). The daily spectral features are principally...
We have investigated the angular distribution of Jovian decameter radiation occurrence probability, relatively to local magnetic field B and its gradient ∇B in source region, using model for Jupiter, based on Juno’s first nine orbits observations, JRM09, was recently proposed by Connerney et al. [Geophys. Res. Lett., 45, 2590-2596, 2018]. The results were compared those obtained earlier older models (O6, VIP4, VIT4 VIPAL). JRM09 confirms former results: radio emission is...
A theoretical model is developed here in order to determine an envelope for the average spectrum of Saturnian kilometric radiation (SKR). The microscopic generation mechanism supposed be so‐called synchrotron (or cyclotron) maser instability. As recent works on terrestrial radiation, effect magnetic field inhomogeneity process must taken into account. Then, assuming that emission nonlinearly saturated by trapping, our calculation allows us put upper limit SKR spectral intensity very simply:...
INSPIRE-SAT 7 is a French 2-Unit CubeSat (11.5 × 11.5 22.7 cm) primarily designed for Earth and Sun observation. one of the missions International Satellite Program in Research Education (INSPIRE). Twice size 4 Rubik’s Cube weighing about 3 kg, will be deployed Low Orbit (LEO) 2023 to join its sister satellite, UVSQ-SAT. represents in-orbit demonstrators needed test how two observation CubeSats orbit can utilized set up satellite constellation. This new scientific technological pathfinder...
Climate change is undeniably one of the most pressing and critical challenges facing humanity in 21st century. In this context, monitoring Earth’s Energy Imbalance (EEI) fundamental conjunction with greenhouse gases (GHGs) order to comprehensively understand address climate change. The French Uvsq-Sat NG pathfinder mission addresses issue through implementation a Six-Unit CubeSat, which has dimensions 111.3 × 36.6 38.8 cm its unstowed configuration. satellite spearheaded by Laboratoire...
Monitoring atmospheric concentrations of greenhouse gases (GHGs) like carbon dioxide and methane in near real time with good spatial resolution is crucial for enhancing our understanding the sources sinks these gases. A novel approach can be proposed using a constellation small satellites equipped miniaturized spectrometers having spectral few nanometers. The objective this study to describe expected results that obtained single satellite named Uvsq-Sat NG. SolAtmos end-to-end simulator its...
Jupiter's nonthermal microwave emission, as measured by a global network of 11 radio telescopes, increased dramatically during the Shoemaker-Levy 9 impacts. The increase was wavelength-dependent, varying from ∼10 percent at 70 to 90 centimeters ∼45 6 and 36 centimeters. spectrum hardened (flattened toward shorter wavelengths) considerably week impacts continued harden afterward. After cometary impacts, flux density began subside all wavelengths still declining 3 months later. Very Large...
UltraViolet & infrared Sensors at high Quantum efficiency onboard a small SATellite (UVSQ-SAT) is satellite the CubeSat standard, whose development began as one of missions in International Satellite Program Research and Education (INSPIRE) consortium 2017. UVSQ-SAT an educational, technological scientific pathfinder mission dedicated to observation Earth Sun. It was imagined, designed, produced tested by LATMOS collaboration with its academic industrial partners, French-speaking...
The detailed analysis of Voyager observations Saturn kilometric radiation (SKR), taking into account the polarization response planetary radio astronomy experiment, has allowed us to study separately high‐frequency limit SKR emitted from northern and southern auroral regions planet. Interpretation variations these limits, in frame a model inspired by cyclotron maser mechanism, demonstrate unambiguously existence magnetic “anomaly”, postulated for years, near‐surface Saturnian field. Its...
Abstract. We investigate the VLF emissions observed by Instrument Champ Electrique (ICE) experiment onboard DEMETER micro-satellite. analyze intensity level variation 10 days before and after occurrence of l'Aquila earthquake (EQ). found a clear decrease received signal related to ionospheric whistler mode (mainly Chorus emission) transmitted DFY station in Germany, few (more than one week) earthquake. The power spectral density decreases more two orders magnitude until EQ, it recovers...
Abstract We investigate the emission cone of Io‐controlled Jovian decameter radiation from layout sources in central meridian longitude (CML)‐Io phase diagram where occurrence is plotted versus (CML) and satellite Io. Four zones enhanced probability are revealed this named Io‐A, Io‐B, Io‐C, Io‐D. propose an angular representation CML‐Io a coordinate system linked to local magnetic field radio source gradient field. The distribution such clearly shows that radiated hollow which not...
We investigate the recent earthquakes (EQs) that occurred on 06 February 2023 principally in central southern part of Turkey and north western Syria. The tectonic plate movements between Anatolian, Arabian African plates are well known to be subject EQs. coordinate epicenter was 37.08°E 37.17°N with depth order 10 km a magnitude Mw7.8. Beside aftershocks, few hours later strong Mw7.7 earthquake same region . consider this analysis Bafa VLF transmitter (TBB) signal emitting...
Strong natural hazards together with their societal impact are usually accompanied by multiple physical phenomena which can be an important information source about the underlying processes.  In this study we statistically analyze lithosphere–atmosphere–ionosphere couplings of magnitude Mw5.5+ earthquakes (EQs) in year 2023 aid sub-ionospheric VLF/LF radio links. The electric field amplitude and phase measurements a temporal resolution one second from...
We report on the recent earthquakes (EQs) that occurred, with main shock 6 February 2023, principally in central southern part of Turkey and northwestern Syria. This region is predisposed to because tectonic plate movements between Anatolian, Arabian, African plates. The seismic epicenter was localized at 37.08°E 37.17°N depth order 10 km magnitude Mw7.8. use Graz’s very-low-frequency VLF facility (15.43°E, 47.06°N) investigate amplitude variation Denizköy transmitter, Didim district Aydin...
Long‐term observations of Jupiter's decametric radiation have shown that a great part emission is modulated by two dominant factors: the planetary rotation and orbital phase Io. The first one indicates occurrence probability depends on observer's longitude, while second factor points to control radio Within framework cyclotron maser instability, which supposed be mechanism at origin most emissions, we estimate efficiency this theoretical footprint Io flux tube during complete revolution...