Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983ap%26ss..92..113k&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 92, no. 1, May 1983, p. 113-134. Research supported by the Matsunaga Scien
Astronomy and Astrophysics
Astrophysics
4
Electromagnetic Fields, Stellar Atmospheres, Stellar Magnetic Fields, Stellar Magnetospheres, Stellar Rotation, Electromagnetism, Electron Mass, Inertia, Ohms Law, Plasma Dynamics
Scientific paper
The structure of the corotating region, which forms an inner portion of a stellar magnetosphere, is reconsidered in a quasi-neutral case by allowing for the inertial effects of electrons, as well as that of ions up to the first order in their mass ratio. It is emphasized that the magnetosphere is not globally equipotential, even in the frame rotating with a central star, owing to the inertial effects of plasma particles. It is shown, however, that the condition of the 'non-Backus' potential being 0 is asymptotically recovered in the corotating regions owing to the presence of the drift current. This current can be taken into account only when delta (the mass ratio of electrons to ions) is not entirely neglected. This fact is seen as suggesting that the deviation of the plasma motion in the outer magnetosphere from the corotation can be attributed to the nonzero non-Backus potential. A globally self-consistent solution is then obtained under this condition (the non-Backus potential being zero). In contradistinction to the solutions in the 'force-free' and 'massless-electron' approximations, this solution has a disk as structure in the corotation zone, where the plasma and the current density are concentrated to a thin disk near the magnetic equator.
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