Now showing items 13-32 of 54 starting with E

    • 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 ...
    • 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 ...
    • 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 ...
    • Equilibrium and stability properties of collisionless current sheet models 

      Wilson, Fiona (University of St Andrews, 2013-06-28) - Thesis
      The work in this thesis focuses primarily on equilibrium and stability properties of collisionless current sheet models, in particular of the force-free Harris sheet model. A detailed investigation is carried out into ...
    • Eruptions and jets in the Sun 

      Lee, Eon Jui (University of St Andrews, 2017-06-23) - Thesis
      Magnetic flux emergence is a fundamental process in the Sun, during which magnetic fields emerge from the solar interior to the surface, to build up active regions and give onset to spectacular dynamic phenomena, such as ...
    • Finite and infinite ergodic theory for linear and conformal dynamical systems 

      Munday, Sara (University of St Andrews, 2011-11-30) - Thesis
      The first main topic of this thesis is the thorough analysis of two families of piecewise linear maps on the unit interval, the α-Lüroth and α-Farey maps. Here, α denotes a countably infinite partition of the unit interval ...
    • The formation and eruption of magnetic flux ropes in solar and stellar coronae 

      Gibb, Gordon Peter Samuel (University of St Andrews, 2015-11-30) - Thesis
      Flux ropes are magnetic structures commonly found in the solar corona. They are thought to play an important role in solar flares and coronal mass ejections. Understanding their formation and eruption is of paramount ...
    • A highly adaptive three dimensional hybrid vortex method for inviscid flows and helically symmetric vortex equilibria 

      Lucas, Daniel (University of St Andrews, 2012-06-22) - Thesis
      This thesis is concerned with three-dimensional vortex dynamics, in particular the modelling of vortex structures in an inviscid context. We are motivated by the open problem of regularity of the inviscid equations, i.e. ...
    • 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. ...
    • 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. ...
    • The investigation of quasi-separatrix layers in solar magnetic fields 

      Restante, Anna Lisa (University of St Andrews, 2011-06-20) - Thesis
      The structure of the magnetic field is often an important factor in many energetic processes in the solar corona. To determine the topology of the magnetic field features such as null points, separatrix surfaces, and ...
    • Magnetic flux transport simulations : applications to solar and stellar magnetic fields 

      Cook, Graeme Robert (University of St Andrews, 2011-11) - Thesis
      Magnetic fields play a key role in a wide variety of phenomena found on the Sun. One such phenomena is the Coronal Mass Ejection (CME) where a large amount of material is ejected from the Sun. CME’s may directly affect ...
    • 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 ...
    • MHD evolution of magnetic null points to static equilibria 

      Fuentes Fernández, Jorge (University of St Andrews, 2011-05-18) - Thesis
      In magnetised plasmas, magnetic reconnection is the process of magnetic field merging and recombination through which considerable amounts of magnetic energy may be converted into other forms of energy. Reconnection is a ...
    • 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 ...
    • MHD simulations of coronal heating 

      Tam, Kuan V. (University of St Andrews, 2014-12-01) - Thesis
      The problem of heating the solar corona requires the conversion of magnetic energy into thermal energy. Presently, there are two promising mechanisms for heating the solar corona: wave heating and nanoflare heating. In ...
    • Modelling chromospheric evaporation in response to coronal heating 

      Johnston, Craig David (University of St Andrews, 2018-06-26) - Thesis
      This thesis presents a new computationally efficient method for modelling the response of the solar corona to the release of energy. During impulsive heating events, the coronal temperature increases which leads to a ...
    • New aspects of particle acceleration in collapsing magnetic traps 

      Eradat Oskoui, Solmaz (University of St Andrews, 2014-01) - Thesis
      Collapsing magnetic traps (CMTs) have been suggested as one of the mechanisms that could contribute to particle energisation in solar flares. The basic idea behind CMTs is that charged particles will be trapped on the ...
    • A non-linear force-free field model for the solar magnetic carpet 

      Meyer, Karen Alison (University of St Andrews, 2012-06-22) - Thesis
      The magnetic carpet is defined to be the small-scale photospheric magnetic field of the quiet Sun. Observations of the magnetic carpet show it to be highly dynamic, where the time taken for all flux within the magnetic ...
    • Numerical modelling of two HMX-based plastic-bonded explosives at the mesoscale 

      Handley, Caroline A. (University of St Andrews, 2011-06-22) - Thesis
      Mesoscale models are needed to predict the effect of changes to the microstructure of plastic-bonded explosives on their shock initiation and detonation behaviour. This thesis describes the considerable progress that has ...