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    Properties of short-wavelength oblique Alfvén and slow waves

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    Authors
    Zhao, J.S.
    Voitenko, Y.
    Yu, M.Y.
    Lu, J.Y.
    Wu, D.J.
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    Discipline
    Physical sciences
    Audience
    Scientific
    Date
    2014
    Metadata
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    Description
    Linear properties of kinetic Alfvén waves (KAWs) and kinetic slow waves (KSWs) are studied in the framework of two-fluid magnetohydrodynamics. We obtain the wave dispersion relations that are valid in a wide range of the wave frequency ω and plasma-to-magnetic pressure ratio β. The KAW frequency can reach and exceed the ion-cyclotron frequency at ion kinetic scales, whereas the KSW frequency remains sub-cyclotron. At β ~ 1, the plasma and magnetic pressure perturbations of both modes are in anti-phase, so that there is nearly no total pressure perturbations. However, these modes also exhibit several opposite properties. At high β, the electric polarization ratios of KAWs and KSWs are opposite at the ion gyroradius scale, where KAWs are polarized in the sense of electron gyration (right-hand polarized) and KSWs are left-hand polarized. The magnetic helicity σ ~ 1 for KAWs and σ ~ –1 for KSWs, and the ion Alfvén ratio RAi << 1 for KAWs and RAi >> 1 for KSWs. We also found transition wavenumbers where KAWs change their polarization from left-handed to right-handed. These new properties can be used to discriminate KAWs and KSWs when interpreting kinetic-scale electromagnetic fluctuations observed in various solar-terrestrial plasmas. This concerns, in particular, identification of modes responsible for kinetic-scale pressure-balanced fluctuations and turbulence in the solar wind.
    Citation
    Zhao, J.S.; Voitenko, Y.; Yu, M.Y.; Lu, J.Y.; Wu, D.J. (2014). Properties of short-wavelength oblique Alfvén and slow waves. , Astrophysical Journal, Vol. 793, Issue 2, 107, DOI: 10.1088/0004-637X/793/2/107.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/2869
    doi: http://dx.doi.org/10.1088/0004-637X/793/2/107
    scopus: 2-s2.0-84907202759
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
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