-
18/05/2026 09:15
-
Dr Alexis Reboul-Salze (Max-Planck Institute for Gravitational Physics)18/05/2026 09:45
Turbulence plays a fundamental role in the transfer, amplification, and dissipation of magnetic and kinetic energy in astrophysical plasmas, from the solar corona to the vicinity of compact objects. In compact objects, including neutron stars, neutron star merger remnants and black-hole accretion flows, turbulent motions are crucial as they drive angular momentum transport, magnetic...
Aller à la page de la contribution -
Dr Yohan Dubois (IAP)18/05/2026 11:30
GeV cosmic rays, accelerated in supernova explosions, represent a significant energetic component of the interstellar medium. Through their coupling to magnetic fields, their ability to efficiently diffuse along field lines, and their long radiative loss timescales, they provide a non-thermal feedback capable of significantly influencing galaxy evolution. In particular, they can alter the...
Aller à la page de la contribution -
Dr Gwenael Giacinti (APC Paris)18/05/2026 14:00
Gamma-ray observations provide important information on cosmic-ray (CR) propagation in our Galaxy.
Aller à la page de la contribution
First, we present a new model of CR propagation in the Milky Way, where CRs are injected at discrete transient sources in the disc. We then calculate the corresponding diffuse Galactic gamma-ray emission. We find that the diffuse gamma-ray emission at >~ 100 TeV is very clumpy, and does not... -
M. Matthieu Bouchet (LAPTH)18/05/2026 15:00
Field line random walk (FLRW) is an essential process involved in charged particle transport, especially cosmic rays (CRs). In general, CR can jump from one FL to another due to scattering processes or because of the finite size of their gyro-motion. However, when the Larmor radius is sufficiently small, CRs tend to move along magnetic FLs for a certain amount of time between scattering...
Aller à la page de la contribution -
Dr Pierre Lesaffre (CNRS/LEPNS)18/05/2026 16:05
I will very briefly review the basics of the legacy of Kolmogorov
Aller à la page de la contribution
turbulence statistics. Interstellar turbulence is very far from the
simplicity of incompressible flows where Kolmogorov ideas
apply. Indeed, the interstellar medium is very dilute, extremely
compressible, multiphase, partially ionised, magnetised, and both dust
and cosmic rays travel are coupled with it. Nevertheless, we... -
Mlle Marie Devinat (IRAP)18/05/2026 17:05
The magnetospheres of giant planets are governed by the interplay of these planets’ fast rotation,
Aller à la page de la contribution
the solar wind and inner plasma sources. In the Saturn and Jupiter magnetospheres, plasma is mainly
produced by the ionization of neutral gas tori at the radial location of active moons: Io at Jupiter
and Enceladus at Saturn. The mechanisms by which these moon-associated plasma sources are... -
Dr Pierre Cristofari (Observatoire de Paris)19/05/2026 09:25
Recent observations have opened a new window on the long-standing question of the origin of Galactic cosmic rays up to PeV energies. In particular, the LHAASO experiment has revealed a population of ultra-high-energy gamma-ray sources extending beyond 100 TeV, providing compelling evidence for Galactic pevatrons (accelerating CRs up to 10$^{15}$ eV). These results challenge the traditional...
Aller à la page de la contribution -
Prof. Tony Bell (University of Oxford)19/05/2026 11:10
Ever since the classic papers of Lagage & Cesarsky (1983) and Hillas (1984), the Bohm limit uBR has been taken as the measure of the maximum energy to which cosmic rays can be accelerated by shocks. The obvious problem in the 1980s was that the Bohm limit for supernova remnants fell well short of the knee in the spectrum at a few PeV. This problem appeared to be solved when fields of a few...
Aller à la page de la contribution -
M. Itamar Cohen (Technion Israel Institute of Technology)19/05/2026 12:10
We will present the characterization of magnetized turbulence generated in a laser-driven plasma. The work was performed at the LULI2000 laser facility (France). Starting from an homogenous magnetized plasma, produced by having a high-strength pulsed magnetic field [1] embedded in a gas jet, we randomly perturbed the gas using a speckled laser beam [2]. Using proton radiography [3], we will...
Aller à la page de la contribution -
Dr Anna Grassi (LULI), Arno Vanthieghem (Observatoire de Paris)19/05/2026 14:00
-
19/05/2026 14:20
Short 2-3 minutes presentation of master student internship
G. Bilosi, X. Gong, TBC
Aller à la page de la contribution -
Dr Gaëtan Fichet de Clairfontaine (University of Würzburg)19/05/2026 14:30
Jets of active galactic nuclei (AGN) rank among the most promising candidates for the sources of extragalactic high-energy neutrinos. In this presentation, I will begin by briefly building a broad picture of these jets first from recent observations, then by covering our current theoretical interpretations of their dynamics and multi-wavelength emissions, which will define a set of open...
Aller à la page de la contribution -
M. Léo Molinier (CEA)19/05/2026 16:15
Compton-driven interactions between ultraintense gamma-ray fluxes and background plasmas are expected to arise in various high-energy astrophysical settings. Self-consistent kinetic investigations into this problem are now accessible via particle-in-cell (PIC) simulations [1-3], which have recently uncovered a rich phenomenology of acceleration processes and plasma instabilities. Here, we...
Aller à la page de la contribution -
Dr Anabella Araudo (Institute of Physics, Czech Academy of Sciences)19/05/2026 16:35
Protostellar jets, reaching velocities of up to 1000 km/s, are a ubiquitous feature of the late stages of star formation. In several systems, these jets exhibit synchrotron radio emission, providing clear evidence for the presence of relativistic electrons and ongoing particle acceleration. Models of non-thermal emission from individual jets indicate that only the most powerful objects -such...
Aller à la page de la contribution -
Dr Pierre Henri ((1) Laboratoire Lagrange, Observatoire Côte d'Azur, Université Côte d'Azur, CNRS, Nice, France & (2) LPC2E, CNRS, Univ. Orléans, CNES, Orléans, France)20/05/2026 09:25
-
20/05/2026 10:25
-
Dr Sophie Masson (LPP - Observatoire de Paris)20/05/2026 11:30
Solar eruptions are initiated and develop in the solar corona and are one of the most extreme manifestation of the sun impulsive release of energy. Solar particles are accelerated during solar eruption. We observe their radiative signatures in the solar atmosphere over a large range of wavelengths from EUV to gamma rays and measure them in-situ in the heliosphere. Solar energetic particles...
Aller à la page de la contribution -
Dr Nicolas Aunai20/05/2026 14:00
Magnetic reconnection at Earth’s magnetopause is the key process controlling the coupling between the solar wind and the magnetosphere, enabling plasma and magnetic flux from the interplanetary medium to enter an otherwise largely closed cavity. A central question is where reconnection develops along the magnetopause, since its location strongly influences the efficiency of this coupling....
Aller à la page de la contribution -
M. Enzo Figueiredo20/05/2026 15:00
-
Dr Valentin Brunn (Arcetri Observatory)20/05/2026 15:50
Young stellar objects host strongly magnetised and highly variable plasma environments in which several acceleration processes may generate suprathermal and non-thermal particles. In this talk, I will discuss two complementary regimes of particle acceleration in the star-disc system. The first is associated with large-scale magnetic reconnection during flares in the innermost regions, where...
Aller à la page de la contribution -
20/05/2026 16:50
Choisissez le fuseau horaire
Le fuseau horaire de votre profil: