Such an enhancement in α has recently been observed in simulations of turbulent transport driven by the magneto-rotational instability (MRI) when convection is present, without requiring a net magnetic flux. ![]() This is measured by the stress to pressure ratio α, with α ≈ 0.1 required in outburst compared to α ≈ 0.01 in quiescence. This model has long been known to imply enhanced angular momentum transport in the accretion disk during outburst. The eruptive cycles of dwarf novae are thought to be due to a thermal-viscous instability in the accretion disk surrounding the white dwarf. Grenoble Alpes, CNRS, Institut de Planétologie et d’Astrophysique de Grenoble (IPAG), 38000 Grenoble, FranceĮ-mail: Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109, USA Astronomical objects: linking to databases. ![]()
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