The Origin of Galactic Cosmic Rays as Revealed by their Composition

Tatischeff, V.; Raymond, J. C.; Duprat, J.; Gabici, S.; Recchia, S.

doi:10.22323/1.395.0153

Cited by 3 publications

(2 citation statements)

References 19 publications

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“…While the colder and denser phases contribute most of the mass in the ISM, those also have the smallest filling factor. Supernovae, instead, most often explode in the media with larger filling factors, as is also hinted at by their composition [48]. For this reason, the CNM and DiM are not considered in this study.…”

Section: The Interstellar Mediummentioning

confidence: 98%

Self-confinement of low-energy cosmic rays around supernova remnants

Jacobs

Mertsch

2022

J. Cosmol. Astropart. Phys.

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Supernova remnants have long been considered as a promising candidate for sources of Galactic cosmic rays. However, modelling cosmic-ray transport around these sources is complicated by the fact that the overdensity of cosmic rays close to their acceleration site can lead to self-confinement, that is the generation of turbulence upon which these particles scatter. Such a highly non-linear problem can be addressed by numerically solving the coupled differential equations describing the evolution in space and time of the escaping particles and of the turbulent plasma waves. In this work, we focus essentially on the propagation of cosmic rays from supernova remnants in the warm ionized and warm neutral phases of the interstellar medium and propose an extended framework to take into account also the effect of energy loss relevant for cosmic rays of energy below 10 GeV. Interestingly, the diffusion coefficient of low-energy cosmic rays could be suppressed by up to 2 orders of magnitude for several tens of kiloyears after the escape from the shock. The cosmic-ray spectrum outside the supernova remnant flattens below 1 GeV at a sufficiently late time reminiscient of the spectral behaviour observed by Voyager. We also find the grammage accumulated around the source to be non-negligible, with important implications for precision fitting of the cosmic-ray spectra.

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Section: The Interstellar Mediummentioning

confidence: 98%

Self-confinement of low-energy cosmic rays around supernova remnants

Jacobs

Mertsch

2022

J. Cosmol. Astropart. Phys.

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“…CRD rapporteur Philipp Mertsch presented [44], making use of our better understanding of the environments of various candidates of CR sources as far as composition is concerned. This builds on the insight that source abundances depend primarily on (1) the composition of the "source reservoir", (2) the ISM phase from which CRs are accelerated and (3) the dust content.…”

Section: Pos(icrc2021)044mentioning

confidence: 99%

Rapporteur Talk: Cosmic Ray Direct

Mertsch¹

2021

Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021)

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This is the report on the cosmic ray direct track of the 37 th International Cosmic Ray Conference (ICRC 2021), broadly covering the contributions relating to charged cosmic rays (CRs) of Galactic origin. The contributions highlighted here are of both observational and theoretical nature and aim at interpreting the local fluxes of CRs as well as studying the wider dynamical effects of CRs. New data from space-borne experiments on CR electrons and positrons, proton and helium as well as heavier nuclei and their isotopes are reviewed. We cover some models of CR acceleration and their feedback on Galactic scales. Diffuse emission in -rays as far as it concerns the CR spectra in the immediate vicinity of the solar system and CR anisotropies are covered briefly. Some upcoming and proposed experiments are highlighted towards the end.

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Cosmic Ray Source and Solar Energetic Particles

Cassé,

Maslov

2023

Problems of Atomic Science and Technology

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The acceleration of particles to the high energy is one of the key issues of solar physics, cis-lunar irradiations, astrophysics, and astroparticle physics. With the development of space astronomy, people started to realize that plasma disturbances in solar flares, Earth’s magnetosphere, and interplanetary space can also produce a large population of non-thermal particles. Cosmic ray promotion i.e. selective energization of matter in the cosmos requires, as on earth, three distinct stages: ionization, injection and acceleration to high energy. Supernova remnants and stellar winds of massive stars grouped in associations appear to be excellent celestial accelerators or re-accelerators through the shock waves they induce in their superbubbles. The injection of ions seems devoted to stars, except the smaller ones. In cosmic several mechanisms lead charged particle acceleration. Electrons are accelerated in direction of Earth’s poles by long train of electric double layers of small amplitudes. Charged particles are accelerated by the pondermotive force of electromagnetic radiation. Also, in a nonequilibrium current plasma or a plasma with particle flows, a strong electric double layer can be formed, which accelerates charged particles to high energies. The reconnection of the magnetic field lines also leads to the acceleration of charged particles.

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The Origin of Galactic Cosmic Rays as Revealed by their Composition

Cited by 3 publications

References 19 publications

Self-confinement of low-energy cosmic rays around supernova remnants

Self-confinement of low-energy cosmic rays around supernova remnants

Rapporteur Talk: Cosmic Ray Direct

Cosmic Ray Source and Solar Energetic Particles

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