Now showing items 36-54 of 54 starting with N∨der=ASC

    • On the emergence and evolution of jets and vortices in turbulent planetary atmospheres 

      Jougla, Thibault (University of St Andrews, 2019-06-25) - Thesis
      This thesis investigates the formation and evolution of jets and vortices in turbulent planetary atmospheres using a dual approach of high-resolution numerical simulations and novel laboratory experiments. A two-layer ...
    • On the properties of single-separator MHS equilibria and the nature of separator reconnection 

      Stevenson, Julie E. H. (University of St Andrews, 2015-06-26) - Thesis
      This thesis considers the properties of MHS equilibria formed through non-resistive MHD relaxation of analytical non-potential magnetic field models, which contain two null points connected by a generic separator. Four ...
    • On the theory of symmetric MHD equilibria with anisotropic pressure 

      Hodgson, Jonathan David Brockie (University of St Andrews, 2016) - Thesis
      In this thesis we discuss the theory of symmetric MHD equilibria with anisotropic pressure. More specifically, we focus on gyrotropic pressures, where the pressure tensor can be split into components along and across the ...
    • On the topology of global coronal magnetic fields 

      Edwards, Sarah J. (University of St Andrews, 2014-12-01) - Thesis
      This thesis considers the magnetic topology of the global solar corona. To understand the magnetic topology we use the magnetic skeleton which provides us with a robust description of the magnetic field. To do this we use ...
    • The origin and dynamic interaction of solar magnetic fields 

      Wilmot-Smith, A.L. (University of St Andrews, 2008-06) - Thesis
      The dynamics of the solar corona are dominated by the magnetic field which creates its structure. The magnetic field in most of the corona is ‘frozen’ to the plasma very effectively. The exception is in small localised ...
    • The period ratio P₁/2P₂ in coronal waves 

      Macnamara, Cicely K. (University of St Andrews, 2011-11-30) - Thesis
      Increasing observational evidence of wave modes brings us to a closer understanding of the solar corona. Coronal seismology allows us to combine wave observations and theory to determine otherwise unknown parameters. The ...
    • 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 ...
    • Relaxation methods in compressible flow 

      Mitchell, A. R. (Andrew R.) (University of St Andrews, 1949) - Thesis
    • Small-scale magnetic feature evolution as observed by Hinode/NFI and SOHO/MDI 

      Thornton, L. M. (University of St Andrews, 2011-11-30) - Thesis
      The surface (photosphere) of the Sun is threaded throughout by magnetic fields. Groups of magnetic fields form magnetic features (of a wide range of sizes in flux and area) on the surface where the fields are directed into ...
    • Solar flare particle acceleration in collapsing magnetic traps 

      Grady, Keith J. (University of St Andrews, 2012-06-22) - Thesis
      The topic of this thesis is a detailed investigation of different aspects of the particle acceleration mechanisms operating in Collapsing Magnetic Traps (CMTs), which have been suggested as one possible mechanism for ...
    • Solar flux emergence : a three-dimensional numerical study 

      Murray, Michelle J. (University of St Andrews, 2008-06) - Thesis
      Flux is continually emerging on the Sun, making its way from the solar interior up into the atmosphere. Emergence occurs on small-scales in the quiet Sun where magnetic fragments emerge, interact and cancel and on large-scales ...
    • Strong interaction between two co-rotating vortices in rotating and stratified flows. 

      Bambrey, Ross R. (University of St Andrews, 2007) - Thesis
      In this study we investigate the interactions between two co-rotating vortices. These vortices are subject to rapid rotation and stable stratification such as are found in planetary atmospheres and oceans. By conducting ...
    • The structure, stability and interaction of geophysical vortices 

      Płotka, Hanna (University of St Andrews, 2013-06-28) - Thesis
      This thesis examines the structure, stability and interaction of geophysical vortices. We do so by restricting our attention to relative vortex equilibria, or states which appear stationary in a co-rotating frame of ...
    • Theoretical magnetic flux emergence 

      MacTaggart, David (University of St Andrews, 2011) - Thesis
      Magnetic flux emergence is the subject of how magnetic fields from the solar interior can rise and expand into the atmosphere to produce active regions. It is the link that joins dynamics in the convection zone with ...
    • Theory of one-dimensional Vlasov-Maxwell equilibria: with applications to collisionless current sheets and flux tubes 

      Allanson, Oliver Douglas (University of St Andrews, 2017-12-07) - Thesis
      Vlasov-Maxwell equilibria are characterised by the self-consistent descriptions of the steady-states of collisionless plasmas in particle phase-space, and balanced macroscopic forces. We study the theory of Vlasov-Maxwell ...
    • Three dimensional MHD simulations of the dynamics and energetics of coronal flux tubes 

      Howson, Thomas Alexander (University of St Andrews, 2019-06-25) - Thesis
      In this thesis we present the results of three-dimensional MHD simulations of the evolution of magnetic flux tubes within the solar atmosphere. We consider the dynamics and energetics of coronal loops that are perturbed ...
    • Topological structure of the magnetic solar corona 

      Maclean, Rhona Claire (University of St Andrews, 2007) - Thesis
      The solar corona is a highly complex and active plasma environment, containing many exotic phenomena such as solar flares, coronal mass ejections, prominences, coronal loops, and bright points. The fundamental element ...
    • 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 ...