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    Resonant phenomena of hydromagnetic waves in non-uniform space plasmas

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    Cadez(2002a).pdf (113.9Kb)
    Authors
    Čadež, V.M.
    De Keyser, J.
    Roth, M.
    Discipline
    Physical sciences
    Subject
    Astrophysics
    Electric corona
    Electromagnetic wave propagation
    Electron resonance
    Energy dissipation
    Free energy
    Magnetic domains
    Plasma stability
    Plasmas
    Hydromagnetic waves
    Incident wave
    Macroscopic mass flow
    Nonuniform plasma configurations
    Nonuniform space plasmas
    Phase synchronism
    Resonant phenomena
    Solar corona
    Magnetohydrodynamics
    Audience
    Scientific
    Date
    2002
    Metadata
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    Description
    In non-uniform plasmas, linear magnetohydrodynamic waves can get into resonant interaction with the background plasma at locations where propagating waves and local modes, existing in regions of pronounced non-uniformity, satisfy the resonant condition of phase synchronism. This leads to a resonant excitation of local modes and growth of their amplitudes. Consequently, the effect of dissipation becomes important which eventually limits the amplitudes to finite values in domains of around resonances. The incident wave then loses its energy and a process known as the resonant wave absorption occurs. In a non-static background plasma, a non-uniform macroscopic mass flow can act as a free energy source, causing phenomena of resonant instability of local modes and over-reflection of incident waves when reflected waves gain energy from the flow. Such resonant processes may appear in magnetic structures in the solar corona, in sunspots, in planetary magnetopauses, bowshocks and magnetotails contributing to energy transfer and transports of other physical quantities. Some of these phenomena can be related to locally enhanced physical quantities as detected by satellites. In this paper, we present a number of analytical and computational approaches in treating the resonant wave behaviour in non-uniform plasma configurations relevant to solar and terrestrial conditions.
    Citation
    Čadež, V.M.; De Keyser, J.; Roth, M. (2002). Resonant phenomena of hydromagnetic waves in non-uniform space plasmas. , Plasma Sources Science and Technology, Vol. 11, Issue 3A, A69-A73, DOI: 10.1088/0963-0252/11/3A/310.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/5224
    doi: http://dx.doi.org/10.1088/0963-0252/11/3A/310
    scopus: 2-s2.0-0036670785
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
    Links
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