Shock acceleration of ions in the heliosphere

Martin A. Lee, R. A. Mewaldt, Joe Giacalone

Research output: Contribution to journalArticle

54 Citations (Scopus)

Abstract

Energetic particles constitute an important component of the heliospheric plasma environment. They range from solar energetic particles in the inner heliosphere to the anomalous cosmic rays accelerated at the interface of the heliosphere with the local interstellar medium. Although stochastic acceleration by fluctuating electric fields and processes associated with magnetic reconnection may account for some of the particle populations, the majority are accelerated by the variety of shock waves present in the solar wind. This review focuses on gradual solar energetic particle (SEP) events including their energetic storm particle (ESP) phase, which is observed if and when an associated shock wave passes Earth. Gradual SEP events are the intense long-duration events responsible for most space weather disturbances of Earth's magnetosphere and upper atmosphere. The major characteristics of gradual SEP events are first described including their association with shocks and coronal mass ejections (CMEs), their ion composition, and their energy spectra. In the context of acceleration mechanisms in general, the acceleration mechanism responsible for SEP events, diffusive shock acceleration, is then described in some detail including its predictions for a planar stationary shock, shock modification by the energetic particles, and wave excitation by the accelerating ions. Finally, some complexities of shock acceleration are addressed, which affect the predictive ability of the theory. These include the role of temporal and spatial variations, the distinction between the plasma and wave compression ratios at the shock, the injection of thermal plasma at the shock into the process of shock acceleration, and the nonlinear evolution of ion-excited waves in the vicinity of the shock.

Original languageEnglish (US)
Pages (from-to)247-281
Number of pages35
JournalSpace Science Reviews
Volume173
Issue number1-4
DOIs
StatePublished - Nov 2012

Fingerprint

heliosphere
energetic particles
shock
energetics
ion
ions
shock wave
plasma
shock waves
plasma compression
particle
Earth magnetosphere
space weather
compression ratio
thermal plasmas
wave excitation
coronal mass ejection
upper atmosphere
cosmic ray
solar wind

Keywords

  • Diffusive shock acceleration
  • Particle acceleration
  • Solar energetic particles

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Shock acceleration of ions in the heliosphere. / Lee, Martin A.; Mewaldt, R. A.; Giacalone, Joe.

In: Space Science Reviews, Vol. 173, No. 1-4, 11.2012, p. 247-281.

Research output: Contribution to journalArticle

Lee, Martin A. ; Mewaldt, R. A. ; Giacalone, Joe. / Shock acceleration of ions in the heliosphere. In: Space Science Reviews. 2012 ; Vol. 173, No. 1-4. pp. 247-281.
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