The example of effective plasma acceleration in a magnetosphere
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The problem of effective transform of Poynting flux energy into the kinetic energy of relativistic plasma outflow in a magnetosphere is considered. In this article we present an example of such acceleration. In order to perform it, we use the approach of ideal axisymmetric magnetohydrodynamics (MHD). For highly magnetized plasma outflow we show that a linear growth of Lorentz factor with a cylindrical distance from the rotational axis is a general result for any field configuration in the sub-magnetosonic flow. In the far region the full magnetohydrodynamics problem for one-dimensional flow is considered. It turns out that the effective plasma outflow acceleration is possible in the paraboloidal magnetic field. It is shown that such an acceleration is due to the drift of charged particles in the crossed electric and magnetic field. The clear explanation of the absence of acceleration in the monopole magnetic field if given.
KeywordsNeutron stars Magnetosphere Plasma acceleration MHD and plasmas
PACS94.30.-d 94.20.wc 95.30.Qd
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- Michel, F.: Theory of Neutron Star Magnetosphere. The University of Chicago Press, Chicago (1991) Google Scholar