Now showing items 21-40 of 178

  • Convectively induced shear instability in large amplitude internal solitary waves 

    Carr, Magda; Fructus, D; Grue, J; Jensen, A; Davies, P A (2008-12) - Journal article
    Laboratory study has been carried out to investigate the instability of an internal solitary wave of depression in a shallow stratified fluid system. The experimental campaign has been supported by theoretical computations ...
  • Copulae on products of compact Riemannian manifolds 

    Jupp, P.E. (2015-09) - Journal article
    Abstract One standard way of considering a probability distribution on the unit n -cube, [0 , 1]n , due to Sklar (1959), is to decompose it into its marginal distributions and a copula, i.e. a probability distribution on ...
  • Coronal heating and nanoflares : current sheet formation and heating 

    Bowness, Ruth; Hood, Alan William; Parnell, Clare Elizabeth (2013-12) - Journal article
    Aims: Solar photospheric footpoint motions can produce strong, localised currents in the corona. A detailed understanding of the formation process and the resulting heating is important in modelling nanoflares, as a mechanism ...
  • Coronal heating by the partial relaxation of twisted loops 

    Bareford, Michael; Hood, Alan; Browning, Philippa (2013-02) - Journal article
    Context: Relaxation theory offers a straightforward method for estimating the energy that is released when a magnetic field becomes unstable, as a result of continual convective driving. Aims: We present new results obtained ...
  • Coronal heating in multiple magnetic threads 

    Tam, Kuan Vai; Hood, Alan William; Browning, Philippa; Cargill, Peter (2015-08) - Journal article
    Context. Heating the solar corona to several million degrees requires the conversion of magnetic energy into thermal energy. In this paper, we investigate whether an unstable magnetic thread within a coronal loop can ...
  • Corotating interaction regions as seen by the STEREO Heliospheric Imagers 2007 – 2010 

    Conlon, Thomas Michael; Milan, S.E.; Davies, J.A.; Williams, A.O. (2015-08) - Journal article
    NASA’s Solar Terrestrial Relations Observatory (STEREO) mission has coincided with a pronounced solar minimum. This allowed for easier detection of corotating interaction regions (CIRs). CIRs are formed by the interaction ...
  • The critical merger distance between two co-rotating quasi-geostrophic vortices 

    Reinaud, Jean Noel; Dritschel, David Gerard (2005-01-10) - Journal article
    This paper examines the critical merger or strong interaction distance between two equal-potential-vorticity quasi-geostrophic vortices. The interaction between the two vortices depends on five parameters: their volume ...
  • Cyclotron maser emission : Stars, planets, and laboratory 

    Vorgul, I.; Kellett, B. J.; Cairns, R Alan; Bingham, Robert; Ronald, K.; Speirs, D.C.; McConville, S. L.; Gillespie, K. M.; Phelps, A. D. R. (2011-05) - Journal article
    This paper is a review of results by the group over the past decade on auroral kilometric radiation and similar cyclotron emissions from stars and planets. These emissions are often attributed to a horseshoe or crescent ...
  • Cyclotron maser radiation from inhomogeneous plasmas 

    Cairns, R Alan; Vorgul, I.; Bingham, Robert; Ronald, K.; Speirs, D. C.; McConville, S. L.; Gillespie, K. M.; Bryson, R.; Phelps, A. D. R.; Kellett, B. J.; Cross, A. W.; Roberston, C. W.; Whyte, C. G.; He, W. (2011-02) - Journal article
    Cyclotron maser instabilities are important in space, astrophysical, and laboratory plasmas. While extensive work has been done on these instabilities, most of it deals with homogeneous plasmas with uniform magnetic fields ...
  • Damping of kink waves by mode coupling : I. Analytical treatment 

    Hood, Alan William; Ruderman, Michael; Pascoe, David James; De Moortel, Ineke; Terradas, Jaume; Wright, Andrew Nicholas (2013-03) - Journal article
    Aims. To investigate the spatial damping of propagating kink waves in an inhomogeneous plasma. In the limit of a thin tube surrounded by a thin transition layer, an analytical formulation for kink waves driven in from the ...
  • Damping of kink waves by mode coupling. II. Parametric study and seismology 

    Pascoe, David James; Hood, Alan William; De Moortel, Ineke; Wright, Andrew Nicholas (2013-02) - Journal article
    Context: Recent observations of the corona reveal ubiquitous transverse velocity perturbations that undergo strong damping as they propagate. These can be understood in terms of propagating kink waves that undergo mode ...
  • Depletion of nonlinearity in the pressure force driving Navier-Stokes flows : nonlinear depletion in NS flows 

    Tran, Chuong Van; Yu, Xinwei (2015-04-17) - Journal article
    The dynamics of the velocity norms ||u||Lq for q ≥ 3, in Navier-Stokes flows is studied. The pressure term that drives this dynamics has a high degree of nonlinear depletion, which owes its origin to a genuine negative ...
  • The detection of numerous magnetic separators in a three-dimensional magnetohydrodynamic model of solar emerging flux 

    Parnell, Clare Elizabeth; Maclean, Rhona Claire; Haynes, Andrew Lewis (2010-12-20) - Journal item
    Magnetic separators in three-dimensional (3D) magnetic fields are believed to be often associated with locations of magnetic reconnection. In this preliminary study, we investigate this relationship using data from a ...
  • Distribution of electric currents in solar active regions 

    Török, T.; Leake, J.E.; Titov, V.S.; Archontis, V.; Mikić, Z.; Linton, M.G.; Dalmasse, K.; Aulanier, G.; Kliem, B. (2014-02-10) - Journal article
    There has been a long-standing debate on the question of whether or not electric currents in solar active regions are neutralized. That is, whether or not the main (or direct) coronal currents connecting the active region ...
  • Dynamic properties of bright points in an active region 

    Keys, P.H.; Mathioudakis, M.; Jess, D.B.; MacKay, D.H.; Keenan, F.P. (2014-06-20) - Journal article
    Context. Bright points (BPs) are small-scale, magnetic features ubiquitous across the solar surface. Previously, we have observed and noted their properties for quiet Sun regions. Here, we determine the dynamic properties ...
  • Effect of collisions on amplification of laser beams by Brillouin scattering in plasmas 

    Humphrey, K. A.; Trines, R. M. G. M.; Fiuza, F.; Speirs, D. C.; Norreys, P.; Cairns, R. A.; Silva, L. O.; Bingham, R. (2013-10) - Journal article
    We report on particle in cell simulations of energy transfer between a laser pump beam and a counter-propagating seed beam using the Brillouin scattering process in uniform plasma including collisions. The results presented ...
  • Effect of gravitational stratification on the propagation of a CME 

    Pagano, Paolo; Mackay, Duncan Hendry; Poedts, Stefaan (2013-12-02) - Journal article
    Our aim is to study the role of gravitational stratification on the propagation of CMEs. In particular, we assess how it influences the speed and shape of CMEs and under what conditions the flux rope ejection becomes a CME ...
  • The effect of interstitial pressure on therapeutic agent transport : coupling with the tumor blood and lymphatic vascular systems 

    Wu, Min; Frieboes, Hermann B.; Chaplain, Mark A. J.; McDougall, Steven R.; Cristini, Vittorio; Lowengrub, John S. (2014-08-21) - Journal article
    Vascularized tumor growth is characterized by both abnormal interstitial fluid flow and the associated interstitial fluid pressure (IFP). Here, we study the effect that these conditions have on the transport of therapeutic ...
  • Effect of Prandtl's ration on balance in geophysical turbulence 

    Dritschel, David Gerard; McKiver, William Joseph (2015-07-21) - Journal article
    The fluid dynamics of the atmosphere and oceans are to a large extent controlled by the slow evolution of a scalar field called ‘potential vorticity’, with relatively fast motions such as inertia-gravity waves playing only ...
  • The effect of slip length on vortex rebound from a rigid boundary 

    Sutherland, D.; Macaskill, C.; Dritschel, D.G. (2013-09-23) - Journal article
    The problem of a dipole incident normally on a rigid boundary, for moderate to large Reynolds numbers, has recently been treated numerically using a volume penalisation method by Nguyen van yen, Farge, and Schneider [Phys. ...