A5026873995- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Quantum Electrodynamics and Casimir Effect
- Thermal Radiation and Cooling Technologies
- Solar Radiation and Photovoltaics
- Geomagnetism and Paleomagnetism Studies
- Astro and Planetary Science
- Advanced Image Fusion Techniques
- Quantum Mechanics and Applications
- Noncommutative and Quantum Gravity Theories
- Mechanical and Optical Resonators
- Stellar, planetary, and galactic studies
- Meteorological Phenomena and Simulations
- Magnetic confinement fusion research
- Geophysics and Gravity Measurements
- Numerical methods in inverse problems
Royal Observatory of Belgium
2022-2024
University of Sheffield
2017-2021
St Petersburg University
2016
Abstract Current magnetohydrodynamics (MHD) models largely rely on synoptic magnetograms, such as the ones produced by Global Oscillation Network Group (GONG). Magnetograms are currently available mostly from front side of Sun, which significantly reduces accuracy MHD modeling. Extreme Ultraviolet (EUV) images can instead be obtained other vantage points. To investigate potential, we explore possibility using EUV information Atmospheric Imaging Assembly (AIA) to directly generate input for...
Context. After their acceleration and release at the Sun, solar energetic particles (SEPs) are injected into interplanetary medium bound to magnetic field (IMF) by Lorentz force. The expansion of IMF close Sun focuses particle pitch-angle distribution, scattering counteracts this focusing. Solar Orbiter observed an unusual event on 9 April 2022 when it was 0.43 astronomical units (au) from Sun. Aims. We show that inferred along which SEPs traveled about three times longer than nominal length...
Diagnosing the solar atmospheric plasma is one of major challenges in physics. Magnetohydrodynamic (MHD) waves, by means applying powerful concept magneto-seismology (SMS), provide a tool to obtain diagnostic insight into magnetised MHD waveguides. This paper provides road-map simple but applicable models waveguides framework Cartesian geometry. We focus on exploiting potential waveguide asymmetry and consider effects steady flow. In particular, dispersion relation describing linear wave...
The model for the interaction of a spinor field with material plane is constructed in framework Symanzik's approach. characteristics scattering process Dirac particles on are calculated. bounced states localized near investigated.The can find application to wide class phenomena arising by quantum electrodynamics fields two-dimensional materials.
Aims. We present validation results for calculations of arrival times and geomagnetic impact coronal mass ejections (CMEs) using the cone spheromak CME models implemented in EUropean Heliospheric FORecasting Information Asset (EUHFORIA). Validating numerical is crucial ensuring their accuracy performance with respect to real data. Methods. compared plasma magnetic field signatures measured situ by satellites at L1 point simulation output EUHFORIA. The this model was carried out two datasets...
In the framework of Symanzik approach model interaction Dirac spinor field with material plane in 3 + 1-dimensional space is constructed. The contains eight real parameters characterizing properties plane. general solution Euler-Lagrange equations and dispersion for bound states are analyzed. It shown that there a choice which connected characterized by law mass-less particle moving along dimensionless Fermi velocity not exceeding one.
Abstract Investigation of magnetohydrodynamic wave propagation in different equilibrium configurations is important for the development solar magnetoseismology. In present work, a magnetized plasma slab sandwiched between an arbitrary number nonmagnetic layers considered and analytical approach used derivation its dispersion relation. This work natural generalization symmetric model studied by Roberts asymmetric magnetic model, Allcock & Erdélyi. Similar to relation slab, unlike...
In the model of interaction spinor field with homogeneous isotropic material plane constructed in framework Symanzik approach, bound states are studied. For localized near Dirac particle expression for current, charge and density presented. state massless dispersion law calculated simplified 2 parameter exactly.The can find application to a wide class phenomena arising by fields quantum electrodynamics two-dimensional materials.
Kink oscillations of coronal loops have been widely studied, both observationally and theoretically, over the past few decades. It has shown that majority observed driven loop appear to damp with either exponential or Gaussian profiles a range mechanisms proposed account for this. However, some seem evolve in manners which cannot be modeled purely profiles, amplification even being on occasions. Recent research incorporating combined effects expansion, resonant absorption, cooling can cause...
We investigate the effects of space weather events on properties turbulence and intermittency detected in magnetosheath Venus Mars compare with  in Earth’s when impacted by same interplanetary event. select two Interplanetary Coronal Mass Ejection (ICME) 2012 which hit Earth one ICME 2018 Mars. use magnetic field plasma data  provided Express, Cluster, MMS MAVEN we apply a full set analysis methods including computation of  Power Spectral Density (PSD),...
Solar energetic particles (SEPs) are bound to the interplanetary magnetic field (IMF) by Lorentz force. The expansion of IMF close Sun focuses particle pitch-angle distribution, and scattering counteracts this focusing. Orbiter observed an unusual solar event on 9 April 2022 when it was at 0.43 astronomical units (au) from Sun. inferred along which SEPs traveled about three times longer than nominal length Parker spiral.Nevertheless, distribution is highly anisotropic, electrons ions appear...
Aims. We present the validation results for arrival times and geomagnetic impact of Coronal Mass Ejections (CMEs), using cone spheromak CME models implemented in EUropean Heliospheric FORecasting Information Asset (EUHFORIA). Validating numerical is crucial ensuring their accuracy performance with respect to real data. Methods. compare plasma magnetic field signatures, measured situ by satellites at L1 point, simulation output EUHFORIA. The this model was carried out two datasets order...
In the model with Chern-Simons potential describing coupling of electromagnetic field a two-dimensional material, possibility appearance bound states, vanishing at sufficiently large distances from interacting its macro-objects, is considered. As an example such material object we consider homogeneous isotropic plane. Its interaction described by modified Maxwell equation singular potential. The analysis their solution shows that state cannot arise without external charges and currents....
We consider fluting oscillations in a thin straight expanding magnetic flux tube the presence of background flow. The is divided into core region that wrapped transitional region, where damping takes place. method multiple scales used for derivation system governing equations. This applicable to study both standing and propagating waves. Furthermore, equations obtained tubes with sharp boundary. An adiabatic invariant derived using Wentzel-Kramer-Brillouin slowly varying density, theoretical...
Current magnetohydrodynamics (MHD) models largely rely on synoptic magnetograms, such as the ones produced by Global Oscillation Network Group (GONG). Magnetograms are currently available mostly from front side of Sun, which significantly reduces accuracy MHD modeling. Extreme Ultraviolet (EUV) images can instead be obtained other vantage points. This study explores possibility using EUV information Atmospheric Imaging Assembly (AIA) to directly generate input for state-of-the-art 3D model...
Abstract The Extreme Ultraviolet Imager (EUI) onboard Solar Orbiter ob-served an eruption through both of its channels (17.4/30.4 nm) Full Sun Imager, on 22 April 2021. At the time, spacecraft was at 0.87 au from Sun,and 98◦ east Sun-Earth line. slightly back-sided, emerging close to southwest limb, starting 04:24 UT, with source located S20W103 perspective. coronagraph, Metis, observed CME 06:05 UT. Spectrometer/Telescope for Imaging X-rays (STIX) sampled associated X-ray flare, which...