Electron acceleration at a high beta and low Mach number rippled shock

Shuichi Matsukiyo, Y. Matsumoto

    Research output: Contribution to journalConference article

    8 Citations (Scopus)

    Abstract

    Electron acceleration in a high plasma beta and low Mach number quasiperpendicular shock is investigated by using two-dimensional full particle-in-cell simulation. Although efficient shock drift acceleration followed by reflection was observed in the previous one-dimensional simulation, no reflected electrons are found due to the effect of shock surface rippling for the particular parameters examined here. Structure of the shock transition region is complex in spite of the high beta and low Mach number situation. In addition to the ion scale fluctuations including the ripple, electron scale fluctuations are also recognized. Among these, downstream fluctuations are dominated by Alfvén ion cyclotron instability, the fluctuations in the foot are due to modified two-stream instability. Electron distribution function in the transition region indicates non-thermal nature. The energy gained by the non-thermal electrons is not explained merely by the shock drift acceleration, implying the importance of local wave- particle interactions.

    Original languageEnglish
    Article number012017
    JournalJournal of Physics: Conference Series
    Volume642
    Issue number1
    DOIs
    Publication statusPublished - Sep 30 2015
    Event14th Annual International Astrophysics Conference: Linear and Nonlinear Particle Energization throughout the Heliosphere and Beyond, AIAC 2015 - Tampa, United States
    Duration: Apr 20 2015Apr 24 2015

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    electron acceleration
    Mach number
    shock
    wave-particle interactions
    electrons
    electron distribution
    ripples
    cyclotrons
    ions
    simulation
    distribution functions
    cells

    All Science Journal Classification (ASJC) codes

    • Physics and Astronomy(all)

    Cite this

    Electron acceleration at a high beta and low Mach number rippled shock. / Matsukiyo, Shuichi; Matsumoto, Y.

    In: Journal of Physics: Conference Series, Vol. 642, No. 1, 012017, 30.09.2015.

    Research output: Contribution to journalConference article

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    abstract = "Electron acceleration in a high plasma beta and low Mach number quasiperpendicular shock is investigated by using two-dimensional full particle-in-cell simulation. Although efficient shock drift acceleration followed by reflection was observed in the previous one-dimensional simulation, no reflected electrons are found due to the effect of shock surface rippling for the particular parameters examined here. Structure of the shock transition region is complex in spite of the high beta and low Mach number situation. In addition to the ion scale fluctuations including the ripple, electron scale fluctuations are also recognized. Among these, downstream fluctuations are dominated by Alfv{\'e}n ion cyclotron instability, the fluctuations in the foot are due to modified two-stream instability. Electron distribution function in the transition region indicates non-thermal nature. The energy gained by the non-thermal electrons is not explained merely by the shock drift acceleration, implying the importance of local wave- particle interactions.",
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