On charge neutrality and dissipative effects in pulsar systems

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Force-Free Magnetic Fields, Magnetic Stars, Magnetohydrodynamics, Pulsars, Stellar Atmospheres, Stellar Models, Angular Velocity, Atmospheric Circulation, Plasma Density, Stellar Magnetic Fields, Stellar Rotation

Scientific paper

It is pointed out that the state of the plasma atmosphere about a rotating magnetized neutron star (pulsar) is a consequence of many dissipative processes in both the atmosphere and the stellar crust. It is shown that it is difficult to construct finite force-free atmospheres which are not associated with a net charge. At present it is an open question whether such systems exist. The point of view is taken that it is at least possible that the preferred state, for times large compared with the dissipative time scale related to transportive processes, is a neutral system. After proving several general results for the infinite atmospheres, two specific models are obtained. A dissipative mechanism is discussed, and other dissipative mechanisms in the atmosphere are compared with those in the crust. It is shown that slippage is a consequence of cross-field fluxes.

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