Now showing items 1-20 of 45

  • Inhomogeneous magnetic fields in the solar atmosphere 

    Browning, Philippa (University of St Andrews, 1984) - Thesis
    The magnetic field in the solar atmosphere is highly inhomogeneous. In the photosphere, the field is concentrated into intense flux tubes and the coronal magnetic field consists of many loops and regions of open field. ...
  • Continued fractions which correspond to two series expansions and the strong Hamburger moment problem 

    Sri Ranga, A. (University of St Andrews, 1984) - Thesis
    Just as the denominator polynomials of a J-fraction are orthogonal polynomials with respect to some moment functional, the denominator polynomials of an M-fraction are shown to satisfy a skew orthogonality relation with ...
  • Applications of statistics in flood frequency analysis 

    Ahmad, Muhammad Idrees (University of St Andrews, 1989) - Thesis
    Estimation of the probability of occurrence of future flood events at one or more locations across a river system is frequently required for the design of bridges, culverts, spillways, dams and other engineering works. ...
  • 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 ...
  • 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 ...
  • Electron cyclotron heating and current drive using the electron Bernstein modes 

    McGregor, Duncan Ekundayo (University of St Andrews, 2007) - Thesis
    Electron Bernstein waves are a mode of oscillation in a plasma, thought a candidate for providing radiofrequency heating and non-inductive current drive in spherical tokamaks. Previous studies of these modes have relied ...
  • Effect of structuring on coronal loop oscillations 

    McEwan, Michael P. (University of St Andrews, 2007-06) - Thesis
    In this Thesis the theoretical understanding of oscillations in coronal structures is developed. In particular, coronal loops are modelled as magnetic slabs of plasma. The effect of introducing inhomogeneities on the ...
  • 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 ...
  • 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 ...
  • Magnetic skeletons and 3D magnetic reconnection 

    Haynes, Andrew L. (University of St Andrews, 2008-06-23) - Thesis
    The upper atmosphere of the sun, the solar corona, is approximately 1,000,000K hotter than the surface of the Sun, a property which cannot be explained by the normal processes of heat conduction and radiation. It is now ...
  • Balance, gravity waves and jets in turbulent shallow water flows 

    Shipton, Jemma (University of St Andrews, 2009) - Thesis
    This thesis contains a thorough investigation of the properties of freely decaying turbulence in a rotating shallow water layer on a sphere. A large number of simulations, covering an extensive range of Froude and Rossby ...
  • The contour-advective semi-Lagrangian hybrid algorithm approach to weather forecasting and freely propagating inertia-gravity waves in the shallow-water system 

    Smith, Robert K. (University of St Andrews, 2009-06-24) - Thesis
    This thesis is aimed at extending the spherical barotropic contour-advective semi-Lagrangian (CASL) Algorithm, written in 1996 by David Dritschel and Maarten Ambaum, to more complex test cases within the shallow-water ...
  • Development and application of a global magnetic field evolution model for the solar corona 

    Yeates, Anthony Robinson (University of St Andrews, 2009-06-24) - Thesis
    Magnetic fields are fundamental to the structure and dynamics of the Sun’s corona. Observations show them to be locally complex, with highly sheared and twisted fields visible in solar filaments/prominences. The free magnetic ...
  • Equilibrium and dynamics of collisionless current sheets 

    Harrison, Michael George (University of St Andrews, 2009-06-24) - Thesis
    In this thesis examples of translationally invariant one-dimensional (1D) Vlasov-Maxwell (VM) equilibria are investigated. The 1D VM equilibrium equations are equivalent to the motion of a pseudoparticle in a conservative ...
  • Aspects of three-dimensional MHD : magnetic reconnection and rotating coronae 

    Al-Salti, Nasser S. (University of St Andrews, 2010-06-23) - Thesis
    Solutions of the magnetohydrodynamic (MHD) equations are very important for modelling laboratory, space and astrophysical plasmas, for example the solar and stellar coronae, as well as for modelling many of the dynamic ...
  • MHD mode conversion of fast and slow magnetoacoustic waves in the solar corona 

    McDougall-Bagnall, A. M. Dee (University of St Andrews, 2010-11-30) - Thesis
    There are three main wave types present in the Sun’s atmosphere: Alfvén waves and fast and slow magnetoacoustic waves. Alfvén waves are purely magnetic and would not exist if it was not for the Sun’s magnetic field. The ...
  • Application of stochastic differential equations and real option theory in investment decision problems 

    Chavanasporn, Walailuck (University of St Andrews, 2010-11-30) - Thesis
    This thesis contains a discussion of four problems arising from the application of stochastic differential equations and real option theory to investment decision problems in a continuous-time framework. It is based on ...
  • Coupling of the solar wind, magnetosphere and ionosphere by MHD waves 

    Russell, Alexander J. B. (University of St Andrews, 2010-11-30) - Thesis
    The solar wind, magnetosphere and ionosphere are coupled by magnetohydrodynamic waves, and this gives rise to new and often unexpected behaviours that cannot be produced by a single, isolated part of the system. This ...
  • 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 ...
  • An investigation into the use of balance in operational numerical weather prediction 

    Devlin, David J.J. (University of St Andrews, 2011) - Thesis
    Presented in this study is a wide-ranging investigation into the use of properties of balance in an operational numerical weather prediction context. Initially, a joint numerical and observational study is undertaken. ...