2020/10/20 by Alexis Marret, Andrea Ciardi, A. Ciardi +4
Physics and Astronomy · #Astrophysics #Astrophysics and Cosmic Phenomena #Atomic physics #Classical mechanics #Computational physics #Condensed matter physics #Cosmic ray #Dark Matter and Cosmic Phenomena #Growth rate #Instability #Kinetic energy #Magnetic field #Mechanics #Nuclear physics #Physics #Plasma #Quantum mechanics #Range (aeronautics) #Solar and Space Plasma Dynamics #Streaming instability #Structure formation #Thermodynamics #Two-stream instability #Work (physics) #astro-ph.HE
paper · pdf · doi:10.1093/mnras/staa3465
Under review in MNRAS
arxiv created 2020/10/20 · openalex publication_date 2020/11/06 · arxiv updated 2020/11/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
ABSTRACT The cosmic rays non-resonant streaming instability is believed to be the source of substantial magnetic field amplification. In this work, we investigate the effects of the ambient plasma temperature on the instability and derive analytical expressions of its growth rate in the hot, demagnetized regime of interaction. To study its non-linear evolution, we perform hybrid-PIC simulations for a wide range of temperatures. We find that in the cold limit, about two-thirds of the cosmic rays drift kinetic energy is converted into magnetic energy. Increasing the temperature of the ambient plasma can substantially reduce the growth rate and the magnitude of the saturated magnetic field.