A5031754993- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Geomagnetism and Paleomagnetism Studies
- Astro and Planetary Science
- Earthquake Detection and Analysis
- Geophysics and Gravity Measurements
- Magnetic confinement fusion research
- Dust and Plasma Wave Phenomena
- Plasma Diagnostics and Applications
- Stellar, planetary, and galactic studies
- Planetary Science and Exploration
- Atmospheric Ozone and Climate
- Radiation Therapy and Dosimetry
- Laser-induced spectroscopy and plasma
- Gas Dynamics and Kinetic Theory
- Scientific Research and Discoveries
- Solar Radiation and Photovoltaics
- Dark Matter and Cosmic Phenomena
- Radiation Effects in Electronics
- Advanced Thermodynamics and Statistical Mechanics
- Medical Research and Practices
- Differential Equations and Numerical Methods
- Aeolian processes and effects
- Electrohydrodynamics and Fluid Dynamics
- Electric Power Systems and Control
Royal Belgian Institute for Space Aeronomy
2008-2023
UCLouvain
1998-2023
Goddard Space Flight Center
1976-2018
Belgonucleaire (Belgium)
2005
Leefmilieu Brussel
2000
Utah State University
1992-1999
Instituts Universitaires de Technologie
1976
An analysis of high resolution magnetic field measurements from the GSPC magnetometer on Explorer 113 showed that low intensities (< 1 y ) in solar wind at AU occur as distinct depressions or "holes," otherwise nearly average conditions.These holes are new kinetic-scale phenomena, having a characteristic dimension order 20,000 km.They rate 1.5/day 18-day interval (March 18 to April 6, 1971) was considered.Most characterized by both depression IBI and change direction, some these possibly...
A kinetic theory is used to model the field‐aligned distribution of auroral electrons along dipole magnetic field lines. Analytical formulae are obtained for particle flux ( J ∥ ) and energy (ε) as functions V , electric potential difference between equatorial source region ionosphere where accelerated precipitated detected by rocket instrumentation. For 1 ≪ eV/E o( ≪500, ε nearly proportional ², E o) parallel thermal electrons; in plasmasheet, =0.2–0.6 keV). The observed values drop usually...
Since observed velocity distributions of particles in the magnetosphere generally have a suprathermal tail instead an exponential one, we propose to recalculate density and temperature nonrotating ion exosphere with Lorentzian distribution function (VDF) Maxwellian. The number density, flux particles, parallel perpendicular pressures, energy different classes been determined for any value index κ characterizing VDF. barometric Maxwellian VDF are compared. It is shown that attractive...
In this paper the application of kinetic theory to collisionless regions polar and solar winds is discussed. A brief historical review given illustrate evolution theoretical models proposed explain main phenomenon observations. The parallelism between development wind stressed especially. approaches were in both cases preceded by hydrodynamic models, their publication gave rise animated controversies; later on, semikinetic hydromagnetic approximations introduced. method, based on quasi...
Typical electron velocity distribution functions observed at 1 AU from the Sun by 3DP instrument onboard Wind are used as boundary conditions to determine function 4 solar radii in corona. The (VDFs) low altitude obtained solving Fokker‐Planck equation, using two different sets of conditions. first set typically corresponds a VDF low‐speed wind flow (i.e., characterized “core” and “halo” electrons); second one high‐speed “core,” “halo,”, “strahl” populations). We use VDFs test particles,...
Abstract. The Whisper instrument yields two data sets: (i) the electron density determined via relaxation sounder, and (ii) spectrum of natural plasma emissions in frequency band 2–80 kHz. Both sets allow for three-dimensional exploration magnetosphere by Cluster mission. total can be derived unambiguously sounder most magnetospheric regions, provided it is range 0.25 to 80 cm-3 . already observed earlier spacecraft are fairly well measured instrument, thanks digital technology which largely...
A simple model for an ion-exosphere with open magnetic field is set up. The ions move under the influence of (1) gravitational field, (2) monotonic decreasing static and (3) electrostatic potential due to a small charge separation. Neglecting collisions particle drift across lines particles can be classified into four classes: ballistic, escaping, trapped, incoming particles. For each class number density, flux, momentum fluxes, energy flux are calculated as function potential. Finally, it...
The current standard models of the radiation-belt environment have many shortcomings, not least which is their extreme age. Most data used for them were acquired in 1960's and early 1970's. Problems with present models, ways from more recent missions are being or can be to create new improved functionality, described. phenomenology radiation belts, effects on space systems, geomagnetic coordinates modeling discussed. Errors found functional limitations, problems implementation use detailed....
Magnetic holes in the interplanetary medium are explained as stationary nonpropagating equilibrium structures which there field‐aligned enhancements of plasma density and/or temperature. antiholes considered to be associated with depressions pressure. In this model observed changes magnetic field intensity and direction due diamagnetic currents that carried by ions drift a sheath result gradients pressure within sheath. The thickness sheaths we consider is approximately few ion Larmor radii....
A total solar eclipse occurred on 20 March 2015, with a totality path passing mostly above the North Atlantic Ocean, which resulted in partial over Belgium and large parts of Europe. In anticipation this event, dedicated observational campaign was set up at Belgian Solar-Terrestrial Centre Excellence (STCE). The objective to perform high-quality observations associated effects geospace environment by utilising advanced space- ground-based instrumentation available STCE order further our...
We present a low altitude (below about 600 km) trapped proton model for solar minimum conditions (1994-1995), based on measurements made by the Proton/Electron Telescope onboard SAMPEX satellite. Substantial differences are found with part of AP-8 MIN model: energy fluxes appear to be overestimated MIN, while new predicts higher than energies above 30 MeV.
This paper provides a detailed description of the Energetic Particle Telescope (EPT) accommodated on board PROBA-V satellite launched May 7th, 2013 LEO, 820 km altitude, 98.7 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">°</sup> inclination and 10:30-11:30 Local Time at Descending Node. The EPT is an ionizing particle spectrometer that was designed based new concept most advanced signal processing technologies: it performs in-flight electron...