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Recent Progress in the Theory of Electron Injection in Collisionless Shocks

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Multi-scale Dynamical Processes in Space and Astrophysical Plasmas

Part of the book series: Astrophysics and Space Science Proceedings ((ASSSP,volume 33))

Abstract

The injection problem in diffusive shock acceleration theory is discussed with particular focus on electrons. The following issues are addressed: Why it has been considered to be so difficult, what is the required condition, and how it can be resolved. It is argued that there exists a critical Mach number above which the electron injection is achieved. Above the threshold, back-streaming electrons reflected back upstream by the shock front can self-generate high-frequency whistler waves, which can scatter themselves as required for subsequent acceleration. The theoretical estimate is found to be well consistent with in-situ measurements, indicating this could provide a possible solution to the long standing problem in the diffusive shock acceleration theory.

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Acknowledgements

T. A. is supported by the Global COE program of Nagoya University (QFPU) and KAKENHI 22740118 from JSPS and MEXT of Japan. This manuscript was written while one of the authors (T. A.) was visiting Max-Planck-Institut für Kernphysik at Heidelberg, Germany.

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Authors and Affiliations

  1. Department of Physics, Nagoya University, Nagoya, Japan

    Takanobu Amano

  2. Max-Planck-Institut für Kernphysik, Heidelberg, Germany

    Takanobu Amano

  3. Department of Earth and Planetary Science, University of Tokyo, Tokyo, Japan

    Masahiro Hoshino

Authors
  1. Takanobu Amano
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  2. Masahiro Hoshino
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Correspondence to Takanobu Amano .

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Editors and Affiliations

  1. , Inst. of Astro- and Particle Physics, University of Innsbruck, Technikerstr. 25, Innsbruck, 6020, Austria

    Manfred P. Leubner

  2. , Inst. of Astro- and Particle Physics, University of Innsbruck, Technikerstr. 25, Innsbruck, 6020, Austria

    Zoltán Vörös

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© 2012 Springer-Verlag Berlin Heidelberg

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Amano, T., Hoshino, M. (2012). Recent Progress in the Theory of Electron Injection in Collisionless Shocks. In: Leubner, M., Vörös, Z. (eds) Multi-scale Dynamical Processes in Space and Astrophysical Plasmas. Astrophysics and Space Science Proceedings, vol 33. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-30442-2_16

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  • DOI: https://doi.org/10.1007/978-3-642-30442-2_16

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  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-30441-5

  • Online ISBN: 978-3-642-30442-2

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