Description
Invited speakers : Y.Dubois (IAP), G. Giacinti (APC), P.Lesaffre (ENS)
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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...
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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...
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Dr Gwenael Giacinti (APC Paris)18/05/2026 14:00
Gamma-ray observations provide important information on cosmic-ray (CR) propagation in our Galaxy.
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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...
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Dr Pierre Lesaffre (CNRS/LEPNS)18/05/2026 16:05
I will very briefly review the basics of the legacy of Kolmogorov
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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,
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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... -
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