685 citations · 731 across the 10 of their papers we have counts for
10 papers
Kinetic-based macro-modeling of the solar wind at large heliocentric distances: Kappa electrons at the exobase
Alexander Vinogradov, Marian Lazar, Ioannis Zouganelis +2
Recent evidence from Parker Solar Probe on the suprathermal electrons with Kappa-type velocity distributions in the outer corona has revived interest in the kinetic-based macro-mod…
A Kinetic Model of Solar Wind Acceleration Driven by Ambipolar Electric Potential and Velocity-Space Diffusion
Maximilien Péters de Bonhome, Viviane Pierrard, Fabio Bacchini
Parker Solar Probe (PSP) observations have revealed that most of the solar wind acceleration occurs very close to the Sun. This acceleration is partly due to the global electric po…
Acceleration of the Solar Wind by Ambipolar Electric Field
Viviane Pierrard, Maximilien Peters de Bonhome
Kinetic exospheric models revealed that the solar wind is accelerated by an ambipolar electric field up to supersonic velocities. The presence of suprathermal Strahl electrons at t…
The detection of ultra-relativistic electrons in low Earth orbit
A. C. Katsiyannis, M. Dominique, V. Pierrard +6
Aims. To better understand the radiation environment in low Earth orbit (LEO), the analysis of in-situ observations of a variety of particles, at different atmospheric heights, and…
Interfacing MHD Single Fluid and Kinetic Exospheric Solar Wind Models and Comparing Their Energetics
Sofia-Paraskevi Moschou, Viviane Pierrard, Rony Keppens +1
An exospheric kinetic solar wind model is interfaced with an observation-driven single fluid magnetohydrodynamic (MHD) model. Initially, a photospheric magnetogram serves as observ…
Collisionless transport equations derived from a kinetic exospheric solar wind model with kappa velocity distribution functions
Gabriel Voitcu, Viviane Pierrard, Herve Lamy +2
In this paper we discuss the collisionless transport equations, continuity, momentum and energy conservation, derived from a kinetic exospheric model of the solar wind based on a k…
Modification of Proton Velocity Distributions by Alfvenic Turbulence in the Solar Wind
Viviane Pierrard, Yuriy Voitenko
In the present paper, the proton velocity distribution function (VDF)in the solar wind is determined by solving numerically the kinetic evolution equation. We compare the results o…
Velocity-Space Proton Diffusion in the Solar Wind Turbulence
Yuriy Voitenko, Viviane Pierrard
We study a velocity-space quasilinear diffusion of the solar wind protons driven by oblique Alfven turbulence at proton kinetic scales. Turbulent fluctuations at these scales posse…
Coronal temperature profiles obtained from kinetic models and from coronal brightness measurements obtained during solar eclipses
V. Pierrard, K. Borremans, J. F. Lemaire
Coronal density, temperature and heat flux distributions for the equatorial and polar corona have been deduced by Lemaire [2012] from Saito's model of averaged coronal white light…
Kappa distributions: theory and applications in space plasmas
V. Pierrard, M. Lazar
Particle velocity distribution functions (VDF) in space plasmas often show non Maxwellian suprathermal tails decreasing as a power law of the velocity. Such distributions are well…