Journées PNHE 2021

Session

Shocks & Cosmic rays: Theory & Simulations

16 sept. 2021, 09:30

Présidents de session

Shocks & Cosmic rays: Theory & Simulations

• David Maurin (LPSC)
• Stefano Gabici

43. Simulations numériques PIC en France : état des lieux et perspectives

Benoît Cerutti (Institut de Planétologie et d'Astrophysique de Grenoble / Université Grenoble Alpes)

16/09/2021 09:30

Les simulations PIC ont révolutionné notre compréhension des phénomènes dissipatifs et d'accélération de particules dans les plasmas spatiaux et astrophysiques. Au cours de la dernière décennie, ces véritables observatoires et microscopes numériques ont rencontré de nombreux succès dans la communauté française, comme l'étude des chocs non-collisionnels, la reconnexion magnétique, ou encore...

64. Microturbulence in unmagnetized relativistic collisionless shock waves

Arno Vanthieghem (SLAC National Accelerator Laboratory)

16/09/2021 09:55

Microturbulence produced by plasma instabilities plays an important role in the dynamics and dissipation mechanisms of relativistic astrophysical collisionless shocks, such as those associated with gamma-ray bursts and blazar environments. We present the tenets of an analytical model that describes the dynamics of the precursor of relativistic unmagnetized collisionless shock waves in...

13. Acceleration and dissipation in Pulsar Wind Nebulae

Virginia Bresci

16/09/2021 10:15

Pulsar Wind Nebulae (PWNe) are complex astrophysical environments where an highly magnetized wind made of electron-positron pairs interacts with the surrounding SN remnant through a relativistic shock wave. While MHD modelling can reproduce the large-scale morphology of PWNe, a refined description of the underpinning kinetic-scale processes is still missing. One open question in this regard is...

3. The non-resonant streaming instability: from theory to experiments

Alexis Marret (LERMA)

16/09/2021 10:35

The non-resonant streaming instability leads to the generation of large amplitude magnetic field fluctuations, and may play an essential role in the acceleration of cosmic rays. We present a study of the non-resonant streaming instability in non-ideal plasma environments with finite temperature and collisionality. We have extended the existing kinetic theory to the case of large plasma...

57. The origin of galactic cosmic rays: progresses, impacts and perspectives

Dr Alexandre Marcowith (LUPM)

16/09/2021 11:05

Cosmic Rays with energies below a fraction of EeV are coming from our galaxy but the way they are produced and they propagate to the Earth is still widely unknown. I will address recent progresses made in our understanding of Cosmic Ray acceleration and propagation on the point of view of microphysics and phenomenological studies. Then, I will shortly discuss why Cosmic Rays feed back are...

4. The Origin of Galactic Cosmic Rays as Revealed by their Composition

Vincent Tatischeff (CSNSM)

16/09/2021 11:30

Galactic cosmic-rays (GCRs) are thought to be accelerated in strong shocks induced by massive star winds and supernova explosions sweeping across the interstellar medium. But the phase of the interstellar medium from which the CRs are extracted has remained elusive up to now. We have studied in detail the GCR source composition deduced from recent measurements by the AMS-02, Voyager 1 and...

47. Discussion

16/09/2021 11:50

44. Acceleration and dissipation in Pulsar Wind Nebulae

Virginia Bresci

46. The non-resonant streaming instability: from theory to experiments

Alexis Marret (LERMA)

45. The Origin of Galactic Cosmic Rays as Revealed by their Composition

Vincent Tatischeff (CSNSM)