Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985ap%26ss.108..337s&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 108, no. 2, Jan. 1985, p. 337-362.
Astronomy and Astrophysics
Astrophysics
2
Centrifugal Force, Earth Magnetosphere, Pulsars, Self Consistent Fields, Stellar Models, Stellar Winds, Atmospheric Models, Electromagnetic Fields, Iterative Solution, Plasma Density
Scientific paper
In order to construct an axisymmetric model of magnetospheres with centrifugal wind, especially of the type II magnetosphere described by Shibata and Kaburaki (1984), a numerical iterative scheme is presented in which a tenuous plasma with conspicuous transfield motion is treated self-consistently with the electromagnetic field. Since the characteristic equations of the flow are solved, there are no numerical diffusion terms obscuring the cause of the transfield motion. The obtained properties of type II magnetosphere are as follows: plasma particles in fact flow out across the closed magnetic-field lines; centrifugal force is exerted powerfully on the positive particles to form a disk-like structure, and the strong electric force makes the negative particles drift to the disk; and the electric field parallel to the disk (Ep) appears and is shown to be necessary for the steady wind to exist. Within the range of the model parameters selected, two reasons for the appearance of Ep are found: plasma density decreases owing to the centrifugal acceleration and becomes insufficient to shield Ep, and the plasma with large inertia moves so as to reduce the charge separation, which would be necessary to shield Ep.
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