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Torsional Alfvén resonances as an efficient damping mechanism for non-radial oscillations in red giant stars
(Oxford University PressMonthly Notices of the Royal Astronomical Society, 2017-06-01)
Stars are self-gravitating fluids in which pressure, buoyancy, rotation and magnetic fields provide the restoring forces for global modes of oscillation. Pressure and buoyancy energetically dominate, while rotation and ...
Quasi-cyclic behaviour in non-linear simulations of the shear dynamo
(Oxford University PressMonthly Notices of the Royal Astronomical Society, 2017-02-17)
The solar magnetic field displays features on a wide range of length-scales including spatial and temporal coherence on scales considerably larger than the chaotic convection that generates the field. Explaining how the ...
MRI turbulence and thermal instability in accretion discs
(Oxford University PressMonthly Notices of the Royal Astronomical Society, 2017-06)
A long-standing puzzle in the study of black hole accretion concerns the presence or not of thermal instability. Classical theory predicts that the encircling accretion disc is unstable, as do some self-consistent ...