Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-09-21
Mon.Not.Roy.Astron.Soc. 316 (2000) 734
Astronomy and Astrophysics
Astrophysics
submited to MNRAS (22 pages, 12 figures; revised version: minor conceptual changes and corrections)
Scientific paper
10.1046/j.1365-8711.2000.03535.x
We generalize a formula for the Goldreich-Julian charge density (\rho), originally derived for rotating neutron star, for arbitrary oscillations of a neutron star with arbitrary magnetic field configuration under assumption of low current density in the inner parts of the magnetosphere. As an application we consider toroidal oscillation of a neutron star with dipole magnetic field and calculate energy losses. For some oscillation modes the longitudinal electric field can not be canceled by putting charged particles in the magnetosphere without a presence of strong electric current j = (c/(\omega r))\rho c. It is shown that the energy losses are strongly affected by plasma in the magnetosphere, and cannot be described by vacuum formulas.
Bisnovatyi-Kogan Gennadi S.
Spruit Hendrik C.
Timokhin Andrey N.
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