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March 28, 2007Open Access

Accretion disc viscosity: how big is alpha?

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Abstract

We consider observational and theoretical estimates of the accretion disc viscosity parameter . We find that in thin, fully ionized discs, the best observational evidence suggests a typical range 0.1-0.4, whereas the relevant numerical simulations tend to derive estimates for which are an order of magnitude smaller. We discuss possible reasons for this apparent discrepancy.

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Authors

A. R. King

Leiden University

J. E. Pringle

University of Cambridge

Mario Livio

Hebrew College

Journals

Monthly Notices of the Royal Astronomical Society

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University of Cambridge

University of Leicester

Space Telescope Science Institute

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King et al. (Wed,) studied this question.

synapsesocial.com/papers/6a108dfb28c2d29469fe862b — DOI: https://doi.org/10.1111/j.1365-2966.2007.11556.x

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Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context:

Elementary heating events – magnetic interactions between two flux sources· 2005 · 36 citations
Confined and Ejective Eruptions of Kink-unstable Flux Ropes· 2005 · 876 citations
ACCRETION AND THE EVOLUTION OF T TAURI DISKS· 1998 · 830 citations
A binary origin for FU Orionis stars· 1992 · 221 citations
The Coronal Topology of the Rapidly Rotating K0 Dwarf AB Doradus. I. Using Surface Magnetic Field Maps to Model the Structure of the Stellar Corona· 2002 · 62 citations

Accretion disc viscosity: how big is alpha?

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Abstract

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