Browsing Department of Materials Science and Metallurgy by Subject "magnetic fields"

Now showing items 1-5 of 5

  • Destruction of large-scale magnetic field in nonlinear simulations of the shear dynamo 

    Teed, Robert John; Proctor, Michael Richard (Oxford University PressMonthly Notices of the Royal Astronomical Society, 2016-03-03)
    The Sun's magnetic field exhibits coherence in space and time on much larger scales than the turbulent convection that ultimately powers the dynamo. In the past the α-effect (mean-field) concept has been used to model the ...

  • Energy requirement for a working dynamo 

    Proctor, Michael Richard (Taylor & FrancisGeophysical & Astrophysical Fluid Dynamics, 2015-10-13)
    There has for many years been interest in finding necessary conditions for dynamo action. These are usually expressed in terms of bounds on integrated properties of the flow. The bounds can clearly be improved when the ...

  • On the nature of the magnetic Rayleigh–Taylor instability in astrophysical plasma: the case of uniform magnetic field strength 

    Hillier, Andrew S. (Oxford University PressMonthly Notices of the Royal Astronomical Society, 2016-07-28)
    The magnetic Rayleigh–Taylor instability has been shown to play a key role in many astrophysical systems. The equation for the growth rate of this instability in the incompressible limit, and the most-unstable mode that ...

  • Quasi-cyclic behaviour in non-linear simulations of the shear dynamo 

    Teed, Robert John; Proctor, Michael Richard (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 ...

  • Quasi-periodic oscillations and the global modes of relativistic, MHD accretion discs 

    Dewberry, Janosz W; Latter, Henrik Nils; Ogilvie, Gordon Ian
    The high-frequency quasi-periodic oscillations (HFQPOs) that punctuate the light curves of X-ray binary systems present a window onto the intrinsic properties of stellar-mass black holes and hence a testbed for general ...