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    Kinetic Theory of Equilibrium Axisymmetric Collisionless Plasmas in Off-equatorial Tori around Compact Objects

    Zdeněk Stuchlík · 01 listopadu, 2013 · Fyzika · 0 comments
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    Publication date: Nov 2013

    Abstract:
    The possible occurrence of equilibrium off-equatorial tori in the
    gravitational and electromagnetic fields of astrophysical compact
    objects has been recently proved based on non-ideal magnetohydrodynamic
    theory. These stationary structures can represent plausible candidates
    for the modeling of coronal plasmas expected to arise in association
    with accretion disks. However, accretion disk coronae are formed by a
    highly diluted environment, and so the fluid description may be
    inappropriate. The question is posed of whether similar off-equatorial
    solutions can also be determined in the case of collisionless plasmas
    for which treatment based on kinetic theory, rather than a fluid one, is
    demanded. In this paper the issue is addressed in the framework of the
    Vlasov-Maxwell description for non-relativistic, multi-species
    axisymmetric plasmas subject to an external dominant spherical
    gravitational and dipolar magnetic field. Equilibrium configurations are
    investigated and explicit solutions for the species kinetic distribution
    function are constructed, which are expressed in terms of generalized
    Maxwellian functions characterized by isotropic temperature and
    non-uniform fluid fields. The conditions for the existence of
    off-equatorial tori are investigated. It is proved that these levitating
    systems are admitted under general conditions when both gravitational
    and magnetic fields contribute to shaping the spatial profiles of
    equilibrium plasma fluid fields. Then, specifically, kinetic effects
    carried by the equilibrium solution are explicitly provided and
    identified here with diamagnetic energy-correction and electrostatic
    contributions. It is shown that these kinetic terms characterize the
    plasma equation of state by introducing non-vanishing deviations from
    the assumption of thermal pressure.

    Authors:
    Cremaschini, Claudio; Kovář, Jiří; Slaný, Petr; Stuchlík, Zdeněk; Karas, Vladimír;

    http://adsabs.harvard.edu/abs/2013ApJS..209…15C

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