Now showing items 1-20 of 160

    • 3D PiC code investigations of Auroral Kilometric Radiation mechanisms 

      Gillespie, K. M.; McConville, S. L.; Speirs, D. C.; Ronald, K.; Phelps, A. D. R.; Bingham, R.; Cross, A. W.; Robertson, C. W.; Whyte, C. G.; He, W.; Vorgul, I.; Cairns, R. A.; Kellett, B. J. (IOP Publishing Ltd., 2014) - Conference item
      Efficient (similar to 1%) electron cyclotron radio emissions are known to originate in the X mode from regions of locally depleted plasma in the Earths polar magnetosphere. These emissions are commonly referred to as the ...
    • Above the noise : the search for periodicities in the inner heliosphere 

      Threlfall, James William; De Moortel, Ineke; Conlon, Thomas Michael (2017-11) - Journal article
      Remote sensing of coronal and heliospheric periodicities can provide vital insight into the local conditions and dynamics of the solar atmosphere. We seek to trace long (one hour or longer) periodic oscillatory signatures ...
    • Alfven wave phase-mixing and damping in the ion cyclotron range of frequencies 

      Threlfall, J.; McClements, K. G.; De Moortel, I. (2011-01) - Journal article
      Aims. We determine the effect of the Hall term in the generalised Ohm's law on the damping and phase mixing of Alfven waves in the ion cyclotron range of frequencies in uniform and non-uniform equilibrium plasmas. Methods. ...
    • The appearance, motion, and disappearance of three-dimensional magnetic null points 

      A. Murphy, Nicholas; Parnell, Clare Elizabeth; Haynes, Andrew Lewis (2015-10-30) - Journal article
      While theoretical models and simulations of magnetic reconnection often assume symmetry such that the magnetic null point when present is co-located with a flow stagnation point, the introduction of asymmetry typically ...
    • Automatic presentations and semigroup constructions 

      Cain, Alan J.; Oliver, Graham; Ruskuc, Nik; Thomas, Richard M. (2010-08) - Journal article
      An automatic presentation for a relational structure is, informally, an abstract representation of the elements of that structure by means of a regular language such that the relations can all be recognized by finite ...
    • Backward wave cyclotron-maser emission in the auroral magnetosphere 

      Speirs, D. C.; Bingham, R.; Cairns, R. A.; Vorgul, I.; Kellett, B. J.; Phelps, A. D. R.; Ronald, K. (2014-10-07) - Journal article
      In this Letter, we present theory and particle-in-cell simulations describing cyclotron radio emission from Earth's auroral region and similar phenomena in other astrophysical environments. In particular, we find that the ...
    • A balanced approach to modelling rotating stably stratified geophysical flows 

      Dritschel, David Gerard; Viúdez, Alvaro (2003-08-10) - Journal article
      We describe a new approach to modelling three-dimensional rotating stratified flows under the Boussinesq approximation. This approach is based on the explicit conservation of potential vorticity, and exploits the underlying ...
    • Balanced solutions for an ellipsoidal vortex in a rotating stratified flow 

      Mckiver, William J.; Dritschel, David G. (2016-09) - Journal article
      We consider the motion of a single ellipsoidal vortex with uniform potential vorticity in a rotating stratified fluid at finite Rossby number . Building on previous solutions obtained under the quasi-geostrophic approximation ...
    • A Bayesian approach to fitting Gibbs processes with temporal random effects 

      King, Ruth; Illian, Janine Baerbel; King, Stuart Edward; Nightingale, Glenna Faith; Hendrichsen, Ditte (2012-12) - Journal article
      We consider spatial point pattern data that have been observed repeatedly over a period of time in an inhomogeneous environment. Each spatial point pattern can be regarded as a “snapshot” of the underlying point process ...
    • Behind and beyond a theorem on groups related to trivalent graphs 

      Havas, George; Robertson, Edmund F.; Sutherland, Dale C. (2008-12) - Journal article
      In 2006 we completed the proof of a five-part conjecture that was made in 1977 about a family of groups related to trivalent graphs. This family covers all 2-generator, 2-relator groups where one relator specifies that a ...
    • Bending and twisting instabilities of columnar elliptical vortices in a rotating strongly stratified fluid 

      Billant, Paul; Dritschel, David Gerard; Chomaz, Jean-Marc (2006-08-25) - Journal article
      In this paper, we investigate the three-dimensional stability of the Moore-Saffman elliptical vortex in a rotating stratified fluid. By means of an asymptotic analysis for long vertical wavelength perturbations and small ...
    • Bifurcations and chaotic dynamics in a tumour-immune-virus system 

      Eftimie, R.; Macnamara, C. K.; Dushoff, Jonathan; Bramson, J. L.; Earn, D. J. D. (2016-12-07) - Journal article
      Despite mounting evidence that oncolytic viruses can be effective in treating cancer, understanding the details of the interactions between tumour cells, oncolytic viruses and immune cells that could lead to tumour control ...
    • Bimodal or quadrimodal? Statistical tests for the shape of fault patterns 

      Healy, David; Jupp, Peter (2018-08-22) - Journal article
      Natural fault patterns formed in response to a single tectonic event often display significant variation in their orientation distribution. The cause of this variation is the subject of some debate: it could be "noise" on ...
    • Blockage of saline intrusions in restricted, two-layer exchange flows across a submerged sill obstruction 

      Cuthbertson, Alan; Laanearu, Janek; Carr, Magda; Sommeria, Joel; Viboud, Samuel (2018-02) - Journal article
      Results are presented from a series of large-scale experiments investigating the internal and near-bed dynamics of bi-directional stratified flows with a net-barotropic component across a submerged, trapezoidal, sill ...
    • Boundary layer flow beneath an internal solitary wave of elevation 

      Carr, Magda; Davies, P A (2010-02) - Journal article
      The wave-induced flow over a fixed bottom boundary beneath an internal solitary wave of elevation propagating in an unsheared, two-layer, stably stratified fluid is investigated experimentally. Measurements of the velocity ...
    • Broadening of the differential emission measure by multi-shelled and turbulent loops 

      Van Doorsselaere, Tom; Antolin, Patrick; Karampelas, Kostas (2018-12) - Journal article
      Context. Broad differential emission measure (DEM) distributions in the corona are a sign of multi-thermal plasma along the line-of-sight.Traditionally, this is interpreted as evidence of multi-stranded loops. Recently, ...
    • Bystander effects and their implications for clinical radiation therapy : insights from multiscale in silico experiments 

      Powathil, Gibin; Munro, Alastair John; Chaplain, Mark Andrew Joseph; Swat, Maciej (2016-07-21) - Journal article
      Radiotherapy is a commonly used treatment for cancer and is usually given in varying doses. At low radiation doses relatively few cells die as a direct response to radiation but secondary radiation effects, such as DNA ...
    • Can substorm particle acceleration be applied to solar flares? 

      Birn, Joachim; Battaglia, Marina; Fletcher, Lyndsay; Hesse, Michael; Neukirch, Thomas (2017-10-20) - Journal article
      Using test particle studies in the electromagnetic fields of three-dimensional magnetohydrodynamic (MHD) simulations of magnetic reconnection, we study the energization of charged particles in the context of the standard ...
    • Cancellative and Malcev presentations for finite Rees index subsemigroups and extensions 

      Cain, Alan James; Robertson, Edmund Frederick; Ruskuc, Nik (2008-02) - Journal article
      It is known that, for semigroups, the property of admitting a finite presentation is preserved on passing to subsemigroups and extensions of finite Rees index. The present paper shows that the same holds true for Malcev, ...
    • The characteristics of billows generated by internal solitary waves 

      Carr, Magda; Franklin, James; King, Stuart Edward; Davies, Peter; Grue, John; Dritschel, David Gerard (2017-02) - Journal article
      The spatial and temporal development of shear-induced overturning billows associated with breaking internal solitary waves is studied by means of a combined laboratory and numerical investigation. The waves are generated ...