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- W1981296322 abstract "In addition to the scalar Shakura–Sunyaev αss turbulent viscosity transport term used in simple analytic accretion disc modelling, a pseudo-scalar transport term also arises. The essence of this term can be captured even in simple models for which vertical averaging is interpreted as integration over a half-thickness and each hemisphere is separately studied. The additional term highlights a complementarity between mean field magnetic dynamo theory and accretion disc theory treated as a mean field theory. Such pseudo-scalar terms have been studied, and can lead to large-scale magnetic field and vorticity growth. Here it is shown that vorticity can grow even in the simplest azimuthal and half-height integrated disc model, for which mean quantities depend only on radius. The simplest vorticity growth solutions seem to have scales and vortex survival times consistent with those required for facilitating planet formation. In addition, it is shown that, when the magnetic back-reaction is included to lowest order, the pseudo-scalar driving the magnetic field growth and that driving the vorticity growth will behave differently with respect to shearing and non-shearing flows: the former pseudo-scalar can more easily reverse sign in the two cases." @default.
- W1981296322 created "2016-06-24" @default.
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- W1981296322 date "2001-05-11" @default.
- W1981296322 modified "2023-09-27" @default.
- W1981296322 title "Implications of mean field accretion disc theory for vorticity and magnetic field growth" @default.
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- W1981296322 doi "https://doi.org/10.1046/j.1365-8711.2001.04225.x" @default.
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