Now showing items 48-67 of 321

  • 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 ...
  • Deciphering satellite observations of compressional ULF waveguide modes 

    Elsden, Tom; Wright, Andrew Nicholas; Hartinger, Michael (2016-04) - Journal article
    We present an analytical method for determining incident and reflection co- efficients for flank ULF compressional waveguide modes in Earth’s magnetosphere. In the flank magnetosphere, compressional waves propagate ...
  • The dependence of coronal loop heating on the characteristics of slow photospheric motions 

    Ritchie, M. L.; Wilmot-Smith, A. L.; Hornig, G. (2016-06-06) - Journal article
    The Parker hypothesis assumes that heating of coronal loops occurs due to reconnection, induced when photospheric motions braid field lines to the point of current sheet formation. In this contribution we address the ...
  • 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 ...
  • Detection of supersonic downflows and associated heating events in the transition region above sunspots 

    Kleint, L.; Antolin, P.; Tian, H.; Judge, P.; Testa, P.; De Pontieu, B.; Martínez-Sykora, J.; Reeves, K. K.; Wuelser, J. P.; McKillop, S.; Saar, S.; Carlsson, M.; Boerner, P.; Hurlburt, N.; Lemen, J.; Tarbell, T. D.; Title, A.; Golub, L.; Hansteen, V.; Jaeggli, S.; Kankelborg, C. (2014-06-27) - Journal article
    Interface Region Imaging Spectrograph data allow us to study the solar transition region (TR) with an unprecedented spatial resolution of 0″33. On 2013 August 30, we observed bursts of high Doppler shifts suggesting strong ...
  • Diffusion driven oscillations in gene regulatory networks 

    Macnamara, Cicely Krystyna; Chaplain, Mark Andrew Joseph (2016-10-21) - Journal article
    Gene regulatory networks (GRNs) play an important role in maintaining cellular function by correctly timing key processes such as cell division and apoptosis. GRNs are known to contain similar structural components, which ...
  • 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 ...
  • Dynamical patterns of coexisting strategies in a hybrid discrete-continuum spatial evolutionary game model 

    Burgess, A. E. F; Schofield, P. G.; Hubbard, S. F.; Chaplain, Mark A. J.; Lorenzi, T. (2016-12-07) - Journal article
    We present a novel hybrid modelling framework that takes into account two aspects which have been largely neglected in previous models of spatial evolutionary games: random motion and chemotaxis. A stochastic individual-based ...
  • 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. ...
  • The effects of line-of-sight integration on multistrand coronal loop oscillations 

    De Moortel, Ineke; Pascoe, David James (2012-02-10) - Journal article
  • Effects of M dwarf magnetic fields on potentially habitable planets 

    Vidotto, A.A.; Jardine, M.; Morin, J.; Donati, J.-F.; Lang, P.; Russell, A.J.B. (2013-09-02) - Journal article
    We investigate the effect of the magnetic fields of M dwarf (dM) stars on potentially habitable Earth-like planets. These fields can reduce the size of planetary magnetospheres to such an extent that a significant fraction ...