On the growth of the thermally modified non-resonant streaming instability

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, demagne...

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Published inMonthly notices of the Royal Astronomical Society Vol. 500; no. 2; pp. 2302 - 2315
Main Authors Marret, A, Ciardi, A, Smets, R, Fuchs, J
Format Journal Article
LanguageEnglish
Published Oxford University Press 01.01.2021
Oxford University Press (OUP): Policy P - Oxford Open Option A
Subjects
Astrophysics
Physics
Plasma Physics
magnetic fields
plasmas
instabilities
acceleration of particles
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Summary: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.
ISSN:0035-8711
1365-2966
DOI:10.1093/mnras/staa3465