Shock modification by cosmic-ray-excited turbulences

Toshio Terasawa, Tohru Hada, Shuichi Matsukiyo, Mitsuo Oka, Aya Bamba, Ryo Yamazaki

    Research output: Contribution to journalArticle

    2 Citations (Scopus)

    Abstract

    In cosmic-ray-mediated shocks large amplitude Alfvén waves are believed to be generated by accelerated cosmic ray particles. The enhanced magnetic pressure shared by these waves is non-negligible in the momentum and energy balances across the shock transition region. Accordingly the shock Rankine-Hugoniot condition is further modified, and the compression ratio across the shock departs from the classical values of 4 (nonrelativistic) and 7 (relativistic). We argue that in the 'grand equipartition' limit, namely equipartition among the waves, the background plasma, and the cosmic ray particles, the compression ratio recovers to the value of 4, and the corresponding spectral index of cosmic ray particles also comes back to the canonical value of 2.

    Original languageEnglish
    Pages (from-to)146-149
    Number of pages4
    JournalProgress of Theoretical Physics Supplement
    Issue number169
    DOIs
    Publication statusPublished - Jan 1 2007

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    cosmic rays
    turbulence
    shock
    compression ratio
    momentum
    energy

    All Science Journal Classification (ASJC) codes

    • Physics and Astronomy (miscellaneous)

    Cite this

    Shock modification by cosmic-ray-excited turbulences. / Terasawa, Toshio; Hada, Tohru; Matsukiyo, Shuichi; Oka, Mitsuo; Bamba, Aya; Yamazaki, Ryo.

    In: Progress of Theoretical Physics Supplement, No. 169, 01.01.2007, p. 146-149.

    Research output: Contribution to journalArticle

    Terasawa, Toshio ; Hada, Tohru ; Matsukiyo, Shuichi ; Oka, Mitsuo ; Bamba, Aya ; Yamazaki, Ryo. / Shock modification by cosmic-ray-excited turbulences. In: Progress of Theoretical Physics Supplement. 2007 ; No. 169. pp. 146-149.
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