Now showing items 1-19 of 19

    • 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 ...
    • The dynamic topology of the solar corona : mapping the Sun’s three dimensional magnetic skeleton 

      Williams, Benjamin Matthew (University of St Andrews, 2018-06-26) - Thesis
      Observations of the surface of the Sun reveal multi-scaled, mixed magnetic features that carpet the entire solar surface. Not surprisingly, the global magnetic fields extrapolated from these observations are highly ...
    • 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 ...
    • 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 ...
    • Fundamental transverse vibrations of the active region solar corona 

      Luna, Manuel; Oliver, Ramon; Antolin, Patrick; Arregui, Inigo (2019-07-11) - Journal article
      Context. Some high-resolution observations have revealed that the active-region solar corona is filled with myriads of thin strandseven in apparently uniform regions with no resolved loops. This fine structure can host ...
    • 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 ...
    • Magnetohydrodynamic kink waves in two-dimensional non-uniform prominence threads 

      Arregui, I; Soler, R; Ballester, J.; Wright, Andrew Nicholas (2011-09) - Journal article
      Aims. We analyse the oscillatory properties of resonantly damped transverse kink oscillations in two-dimensional prominence threads. Methods. The fine structures are modelled as cylindrically symmetric magnetic flux tubes ...
    • Magnetohydrodynamic simulations of the ejection of a magnetic flux rope 

      Pagano, Paolo; Mackay, Duncan Hendry; Poedts, Stefaan (2013-06) - Journal article
      Context. Coronal mass ejections (CME’s) are one of the most violent phenomena found on the Sun. One model to explain their occurrence is the flux rope ejection model. In this model, magnetic flux ropes form slowly over ...
    • 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 ...
    • Numerical simulations of sunspot rotation driven by magnetic flux emergence 

      Sturrock, Zoe (University of St Andrews, 2017-06-23) - Thesis
      Magnetic flux continually emerges from the Sun, rising through the solar interior, emerging at the photosphere in the form of sunspots and expanding into the atmosphere. Observations of sunspot rotations have been reported ...
    • Observing the formation of flare-driven coronal rain 

      Scullion, E.; Rouppe Van Der Voort, L.; Antolin, P.; Wedemeyer, S.; Vissers, G.; Kontar, E. P.; Gallagher, P. (2016-12-20) - Journal article
      Flare-driven coronal rain can manifest from rapidly cooled plasma condensations near coronal loop-tops in thermally unstable post-flare arcades. We detect 5 phases that characterise the post-flare decay:heating, evaporation, ...
    • On the application of numerical continuation methods to two- and three-dimensional solar and astrophysical problems 

      Romeou, Zaharenia (University of St Andrews, 2002-06) - Thesis
      In this thesis, applications of a numerical continuation method to two- and three-dimensional bifurcation problems are presented. The 2D problems are motivated by solar applications. In particular, it is shown that the ...
    • Recent advances in coronal heating 

      De Moortel, I.; Browning, P. (2015-05-28) - Journal article
      The solar corona, the tenuous outer atmosphere of the Sun, is orders of magnitude hotter than the solar surface. This 'coronal heating problem' requires the identification of a heat source to balance losses due to thermal ...
    • 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 ...
    • Solar science with the Atacama Large Millimeter/Submillimeter Array — a new view of our sun 

      Wedemeyer, S.; Bastian, T.; Brajša, R.; Hudson, H.; Fleishman, G.; Loukitcheva, M.; Fleck, B.; Kontar, E. P.; De Pontieu, B.; Yagoubov, P.; Tiwari, S. K.; Soler, R.; Black, J. H.; Antolin, P.; Scullion, E.; Gunár, S.; Labrosse, N.; Ludwig, H.-G.; Benz, A. O.; White, S. M.; Hauschildt, P.; Doyle, J. G.; Nakariakov, V. M.; Ayres, T.; Heinzel, P.; Karlicky, M.; Van Doorsselaere, T.; Gary, D.; Alissandrakis, C. E.; Nindos, A.; Solanki, S. K.; Rouppe van der Voort, L.; Shimojo, M.; Kato, Y.; Zaqarashvili, T.; Perez, E.; Selhorst, C. L.; Barta, M. (2016-04) - Journal article
      The Atacama Large Millimeter/submillimeter Array (ALMA) is a new powerful tool for observing the Sun at high spatial, temporal, and spectral resolution. These capabilities can address a broad range of fundamental scientific ...
    • Thermal conduction effects on the kink instability in coronal loops 

      Botha, G. J. J.; Arber, T. D.; Hood, A. W. (2011-01) - Journal article
      Context. Heating of the solar corona by nanoflares, which are small transient events in which stored magnetic energy is dissipated by magnetic reconnection, may occur as the result of the nonlinear phase of the kink ...
    • Transverse, propagating velocity perturbations in solar coronal loops 

      De Moortel, Ineke; Pascoe, David James; Wright, Andrew Nicholas; Hood, Alan William (2016-01) - Journal item
      As waves and oscillations carry both energy and information, they have enormous potential as a plasma heating mechanism and, through seismology, to provide estimates of local plasma properties which are hard to obtain from ...