A unified transport equation for both cosmic rays and thermal particles

L. L. Williams; N. Schwadron; J. R. Jokipii; T. I. Gombosi

doi:10.1086/186770

A unified transport equation for both cosmic rays and thermal particles

L. L. Williams, N. Schwadron, J. R. Jokipii, T. I. Gombosi

Lunar and Planetary Lab

Research output: Contribution to journal › Article › peer-review

24 Scopus citations

Abstract

We present a unified transport equation that is valid for particles of all energies if the particle mean free paths are much smaller than macroscopic fluid length scales. If restricted to particles with random speeds much greater than fluid flow speeds, this equation reduces to the previously discussed extended cosmic-ray transport equation. It is significant that this allows one to describe the acceleration of particles from thermal energies to cosmic-ray energies using one transport equation. This is in contrast to previous transport equations (the Parker equation and the extended cosmic-ray transport equation), which were restricted to fast particles. The close connection to the extended cosmic-ray transport equation is demonstrated.

Original language	English (US)
Pages (from-to)	L79-L81
Journal	Astrophysical Journal
Volume	405
Issue number	2 PART 2
DOIs	https://doi.org/10.1086/186770
State	Published - Mar 10 1993

Keywords

Acceleration of particles
Cosmic rays

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/186770

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AU - Williams, L. L.

AU - Schwadron, N.

AU - Jokipii, J. R.

AU - Gombosi, T. I.

PY - 1993/3/10

Y1 - 1993/3/10

N2 - We present a unified transport equation that is valid for particles of all energies if the particle mean free paths are much smaller than macroscopic fluid length scales. If restricted to particles with random speeds much greater than fluid flow speeds, this equation reduces to the previously discussed extended cosmic-ray transport equation. It is significant that this allows one to describe the acceleration of particles from thermal energies to cosmic-ray energies using one transport equation. This is in contrast to previous transport equations (the Parker equation and the extended cosmic-ray transport equation), which were restricted to fast particles. The close connection to the extended cosmic-ray transport equation is demonstrated.

AB - We present a unified transport equation that is valid for particles of all energies if the particle mean free paths are much smaller than macroscopic fluid length scales. If restricted to particles with random speeds much greater than fluid flow speeds, this equation reduces to the previously discussed extended cosmic-ray transport equation. It is significant that this allows one to describe the acceleration of particles from thermal energies to cosmic-ray energies using one transport equation. This is in contrast to previous transport equations (the Parker equation and the extended cosmic-ray transport equation), which were restricted to fast particles. The close connection to the extended cosmic-ray transport equation is demonstrated.

KW - Acceleration of particles

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A unified transport equation for both cosmic rays and thermal particles

Abstract

Keywords

ASJC Scopus subject areas

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