A5065740298- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Magnetic confinement fusion research
- Plasma Diagnostics and Applications
- Geomagnetism and Paleomagnetism Studies
- Astro and Planetary Science
- Dust and Plasma Wave Phenomena
- Earthquake Detection and Analysis
- Gas Dynamics and Kinetic Theory
- Particle accelerators and beam dynamics
- Magnetic Field Sensors Techniques
- Planetary Science and Exploration
- Laser-induced spectroscopy and plasma
- Geophysics and Gravity Measurements
- Fluid Dynamics and Turbulent Flows
- Nuclear reactor physics and engineering
- Laser-Plasma Interactions and Diagnostics
- Computational Fluid Dynamics and Aerodynamics
- Magnetic Properties and Applications
- Atomic and Molecular Physics
- Lattice Boltzmann Simulation Studies
- Computational Physics and Python Applications
- Advanced Numerical Methods in Computational Mathematics
- Particle Dynamics in Fluid Flows
- Electrohydrodynamics and Fluid Dynamics
KU Leuven
2016-2025
Space Science Institute
2018-2025
Polytechnic University of Turin
1997-2025
Statistics Belgium
2024
Centre of Plasma Physics - Institute for Plasma Research
2012-2022
Royal Observatory of Belgium
2018
Swedish Institute of Space Physics
2013
European Union
2013
Laboratory for Atmospheric and Space Physics
2011
University of Colorado Boulder
2011
There is a growing appreciation that the environmental conditions we call space weather impact technological infrastructure powers coupled economies around world. With comes need to better shield society against by improving forecasts, specifications, and design. [...] advanced understanding of requires coordinated international approach effectively provide awareness processes within Sun-Earth system through observation-driven models. This roadmap prioritizes scientific focus areas research...
The results of kinetic simulations magnetic reconnection in Harris current sheets are analyzed. A range guide fields is considered to study plasmas characterized by different β values, β>me/mi. Both an implicit particle-in-cell (PIC) simulation method and a parallel explicit PIC code used. Simulations with mass ratios up the physical value performed. show that rate decreases field depends weakly on ratio. off-diagonal components electron pressure tensor break frozen-in condition, even...
Within a MHD approach we find magnetic reconnection to progress in two entirely different ways. The first is well known: the laminar Sweet-Parker process. But second, completely and chaotic process possible. This regime has properties of immediate practical relevance: (i) it much faster, developing on scales order Alfvén time, (ii) areas become distributed chaotically over macroscopic region. onset faster formation closed-circulation patterns where jets going out regions turn around force...
Abstract In this study, we apply a new method—the first‐order Taylor expansion (FOTE)—to find magnetic nulls and reconstruct field topology, in order to use it with the data from forthcoming MMS mission. We compare method previously used Poincare index (PI), that they are generally consistent, except PI can only null inside spacecraft (SC) tetrahedron, while FOTE both outside tetrahedron also deduce its drift velocity. addition, (1) avoid limitations of such as resolution, instrument...
Abstract The Magnetospheric Multiscale spacecraft encountered an electron diffusion region (EDR) in a symmetric reconnection the Earth’s magnetotail. EDR contained guide field of about 2 nT, which was 13% magnetic inflow region, and its thickness local inertial lengths. Intense energy dissipation, super-Alfvénic jet, nongyrotropy, crescent-shaped velocity distributions were observed association with this EDR. These features are similar to those EDRs asymmetric at dayside magnetopause....
We report unambiguous in situ observation of the coalescence macroscopic flux ropes by magnetospheric multiscale (MMS) mission. Two coalescing with sizes $\ensuremath{\sim}1\text{ }\text{ }{R}_{E}$ were identified at subsolar magnetopause occurrence an asymmetric quadrupolar signature normal component magnetic field measured MMS spacecraft. An electron diffusion region (EDR) a width four local inertial lengths was embedded within merging current sheet. The EDR characterized intense parallel...
We compare relativistic particle integrators commonly used in plasma physics showing several test cases relevant for astrophysics. Three explicit pushers are considered, namely the Boris, Vay, and Higuera-Cary schemes. also present a new fully implicit integrator that is energy conserving. Furthermore, method based on guiding center approximation included. The algorithms described such they can be readily implemented magnetohydrodynamics codes or Particle-in-Cell codes. Our comparison...
Data-driven science and technology offer transformative tools methods to science. This review article highlights the latest development progress in interdisciplinary field of data-driven plasma (DDPS), i.e., whose is driven strongly by data analyses. Plasma considered be most ubiquitous form observable matter universe. Data associated with plasmas can, therefore, cover extremely large spatial temporal scales, often provide essential information for other scientific disciplines. Thanks...
The lower-hybrid drift instability is simulated in an ion-scale current sheet using a fully kinetic approach with values of the ion to electron mass ratio up ${m}_{i}/{m}_{e}=1836$. Although localized on edge layer, nonlinear development increases flow velocity central region resulting strong bifurcation density and significant anisotropic heating electrons. This dramatically enhances collisionless tearing mode may lead rapid onset magnetic reconnection for sheets near critical scale.
Kinetic plasma simulation typically requires to handle a multiplicity of space and time scales. The implicit moment particle in cell (PIC) method provides possible route address the presence multiple scales effectively. Here, new implementation is described. present paper has two goals. First, most modern While many algorithms involved have been developed past, reports for first how currently implemented what specific found work best. Second, we CELESTE3D code, fully electromagnetic kinetic...
Abstract We investigate current‐driven modes developing at jet fronts during collisionless reconnection. Initial evolution of the reconnection is simulated using conventional 2‐D setup starting from Harris equilibrium. Three‐dimensional PIC calculations are implemented later stages, when fully formed. Intense currents and enhanced wave activity generated because interaction fast flow plasma denser ambient current sheet plasma. The study reveals that lower hybrid drift instability develops...
Massively parallel numerical simulations of magnetic reconnection are presented in this study. Electromagnetic full‐particle implicit code iPIC3D is used to study the dynamics and 3‐D evolution outflows. Such features as Hall field, inflow outflow, diffusion region formation very similar 2‐D particle‐in‐cell (PIC) simulations. In addition, it well known that instabilities develop current flow direction or oblique directions. These modes could provide for anomalous resistivity diffusive drag...
The Magnetosphere Multiscale Mission (MMS) will provide the first opportunity to probe electron-scale physics during magnetic reconnection in Earth's magnetopause and magnetotail. This article address only tail reconnection—as a non-steady-state process which reconnected field lines advance away from $x$ -point flux pile-up fronts directed Earthward anti-Earthward. An up-to-date microscopic physical picture of electron ion-scale collisionless processes is presented based on 2-D...
Abstract Dipolarization fronts (DFs) are often associated with the leading edge of earthward bursty bulk flows in magnetotail plasma sheet. Here multispacecraft Time History Events and Macroscale Interactions during Substorms (THEMIS) observations used to show that a spatially limited region counterpropagating ion beams, whose existence is not evident either moments or electric field, observed on low‐density side DFs. The THEMIS magnetic field data establish appropriate comparison cuts...
We report observations from the Magnetospheric Multiscale satellites of parallel electric fields (E_{∥}) associated with magnetic reconnection in subsolar region Earth's magnetopause. E_{∥} events near electron diffusion have amplitudes on order 100 mV/m, which are significantly larger than those predicted for an antiparallel field. This Letter addresses specific types events, appear as large-amplitude, unipolar spikes that tangled, reconnected fields. These primarily or a current layer...
The rapid growth of high-dimensional data in solar physics presents significant challenges for analysis and interpretation, making it an excellent domain the application machine learning (ML) algorithms. Synoptic full-disk observations with Solar Dynamics Observatory (SDO)  provide continuous magnetic activity over more than one cycle, facilitating study variability space weather impacts. Space-weather HMI Active Region Patches (SHARP) vector field (VMF) maps parameters, based on...