Now showing items 21-29 of 29

  • Phase mixing of nonlinear visco-resistive Alfvén waves 

    McLaughlin, James Alexander; De Moortel, Ineke; Hood, Alan W. (2011-02) - Journal article
    Aims: We investigate the behaviour of nonlinear, nonideal Alfvén wave propagation within an inhomogeneous magnetic environment. Methods: The governing MHD equations are solved in 1D and 2D using both analytical techniques ...
  • Potential Evidence for the Onset of Alfvénic Turbulence in Trans-equatorial Coronal Loops 

    De Moortel, Ineke; McIntosh, Scott; Threlfall, James William; Bethge, Christian; Liu, J (2014-02-10) - Journal article
    This study investigates Coronal Multi-channel Polarimeter Doppler-shift observations of a large, off-limb, trans-equatorial loop system observed on 2012 April 10-11. Doppler-shift oscillations with a broad range of frequencies ...
  • Propagating coupled Alfvén and kink oscillations in an arbitrary inhomogeneous corona 

    Pascoe, David James; Wright, Andrew Nicholas; De Moortel, Ineke (2011-04-10) - Journal article
    Observations have revealed ubiquitous transverse velocity perturbation waves propagating in the solar corona. We perform three-dimensional numerical simulations of footpoint-driven transverse waves propagating in a low β ...
  • Propagation and damping of MHD waves in the solar atmosphere 

    Kiddie, Greg (University of St Andrews, 2014-06-27) - Thesis
    Quasi-periodic disturbances have been observed in the outer solar atmosphere for many years. Although first interpreted as upflows (Schrijver et al. (1999)), they have been widely regarded as slow magneto-acoustic waves, ...
  • The propagation and damping of slow magnetoacoustic waves in the solar atmosphere 

    Owen, Nicholas Robert (University of St Andrews, 2012-11-30) - Thesis
    The propagation and damping of slow magnetoacoustic waves in the solar atmosphere is investigated, with particular emphasis placed on waves with periodicities of five minutes. The basic model of a uniform temperature ...
  • Standing kink modes in three-dimensional coronal loops 

    De Moortel, Ineke; Pascoe, David James (2014-03-11) - Journal article
    So far, the straight flux tube model proposed by Edwin & Roberts is the most commonly used tool in practical coronal seismology, in particular, to infer values of the (coronal) magnetic field from observed, standing kink ...
  • Transverse wave induced Kelvin-Helmholtz rolls in spicules 

    Antolin, Patrick; Schmit, Don; Pereira, Tiago M. D.; De Pontieu, Bart; De Moortel, Ineke (2018-03-23) - Journal article
    In addition to their jet-like dynamic behaviour, spicules usually exhibit strong transverse speeds, multi-stranded structure and heating from chromospheric to transition region temperatures. In this work we first analyse ...
  • Transverse, propagating velocity perturbations in solar coronal loops 

    De Moortel, Ineke; Pascoe, David James; Wright, Andrew Nicholas; Hood, Alan W. (2016-01) - Journal item
    As waves and oscillations carry both energy and information, they have enormous potential as a plasma heating mechanism and, through seismology, to provide estimates of local plasma properties which are hard to obtain from ...
  • Wave propagation, phase mixing and dissipation in Hall MHD 

    Threlfall, James W. (University of St Andrews, 2012-06-22) - Thesis
    In this thesis the effect of the Hall term in the generalised Ohm’s law on Alfvén (shear) and fast wave propagation and dissipation in the ion cyclotron frequency range is investigated. The damping of an initially ...