Acceleration of particles in imbalanced magnetohydrodynamic turbulence

B. Teaca, M.S. Weidl, F. Jenko, R. Schlickeiser

    Research output: Contribution to journalArticle

    6 Citations (Scopus)
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    Abstract

    The present work investigates the acceleration of test particles, relevant to the solar-wind problem, in balanced and imbalanced magnetohydrodynamic turbulence (terms referring here to turbulent states possessing zero and nonzero cross helicity, respectively). These turbulent states, obtained numerically by prescribing the injection rates for the ideal invariants, are evolved dynamically with the particles. While the energy spectrum for balanced and imbalanced states is known, the impact made on particle heating is a matter of debate, with different considerations giving different results. By performing direct numerical simulations, resonant and nonresonant particle accelerations are automatically considered and the correct turbulent phases are taken into account. For imbalanced turbulence, it is found that the acceleration rate of charged particles is reduced and the heating rate diminished. This behavior is independent of the particle gyroradius, although particles that have a stronger adiabatic motion (smaller gyroradius) tend to experience a larger heating.
    Original languageEnglish
    Article number021101
    JournalPhysical Review E
    Volume90
    Issue number2
    DOIs
    Publication statusPublished - 11 Aug 2014

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    magnetohydrodynamic turbulence
    Turbulence
    Heating
    heating
    direct numerical simulation
    Helicity
    solar wind
    Energy Spectrum
    charged particles
    energy spectra
    turbulence
    Tend
    Invariant
    Motion
    Zero
    Term

    Bibliographical note

    ©American Physical Society

    Cite this

    Acceleration of particles in imbalanced magnetohydrodynamic turbulence. / Teaca, B.; Weidl, M.S.; Jenko, F.; Schlickeiser, R.

    In: Physical Review E, Vol. 90, No. 2, 021101, 11.08.2014.

    Research output: Contribution to journalArticle

    Teaca, B. ; Weidl, M.S. ; Jenko, F. ; Schlickeiser, R. / Acceleration of particles in imbalanced magnetohydrodynamic turbulence. In: Physical Review E. 2014 ; Vol. 90, No. 2.
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