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You searched for +publisher:"University of St. Andrews" +contributor:("Hood, Alan W"). Showing records 1 – 2 of 2 total matches.

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University of St. Andrews

1. Goldstraw, Erin Elizabeth. Modelling solar coronal magnetic field evolution .

Degree: 2019, University of St. Andrews

Footpoint motions at the photosphere can inject energy into the magnetic field in the solar corona. This energy is then released in the corona as heat. There are many mathematical approaches to model the evolution of these magnetic fields. Magnetohydrodynamics (MHD) provides the most convenient and practical approach. However, there are many alternative approximate methods. It is difficult to know when an approximate method is valid and how well the assumptions need to be satisfied for the solutions to be accurate enough. To illustrate this, a simple experiment is performed. Four approximate methods, including Reduced MHD (RMHD), are used to model the evolution of a footpoint driven coronal loop through sequences of equilibria. The predicted evolution from each method is compared to the solution from full MHD simulations to test the accuracy of each method when the relevant assumptions are adjusted. After this initial test, the validity of RMHD is investigated for the particular case of the magnetic field evolution involving the development of the tearing instability. Full MHD simulations are used to argue the applicability of the assumptions and conditions of RMHD for this evolution. The potential of this setup to heat the corona is considered by performing full MHD simulations including thermodynamic processes of optically thin radiation and thermal conduction. These additional processes are not included in RMHD. Advisors/Committee Members: Hood, Alan W (advisor).

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Goldstraw, E. E. (2019). Modelling solar coronal magnetic field evolution . (Thesis). University of St. Andrews. Retrieved from http://hdl.handle.net/10023/19238

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Goldstraw, Erin Elizabeth. “Modelling solar coronal magnetic field evolution .” 2019. Thesis, University of St. Andrews. Accessed July 03, 2020. http://hdl.handle.net/10023/19238.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Goldstraw, Erin Elizabeth. “Modelling solar coronal magnetic field evolution .” 2019. Web. 03 Jul 2020.

Vancouver:

Goldstraw EE. Modelling solar coronal magnetic field evolution . [Internet] [Thesis]. University of St. Andrews; 2019. [cited 2020 Jul 03]. Available from: http://hdl.handle.net/10023/19238.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Goldstraw EE. Modelling solar coronal magnetic field evolution . [Thesis]. University of St. Andrews; 2019. Available from: http://hdl.handle.net/10023/19238

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


University of St. Andrews

2. Herbert, Simon I. WKB estimates to the critical length of twisted solar coronal loops .

Degree: 1995, University of St. Andrews

The solar corona exhibits many different phenomena, observable from the Earth or space. Magnetohydrodynamic stability theory provides a method of investigating these phenomena by using it to test proposed mathematical models. WKB is a way of approximating the solutions of second order linear homogeneous differential equations with large parameters and so together with MHD stability theory, models for solar coronal loops can be investigated. In this thesis, the problem of a line tied twisted coronal loop is studied within the framework of ideal MHD using a WKB approximation to estimate the critical length at which the various magnetic fields become unstable. The problem will be split into two halves: (i) force-free and (ii) non force-free fields. Using a finite element/Fourier method, the full MHD equations will be solved numerically and the results compared with analytical solutions. Advisors/Committee Members: Hood, Alan W (advisor).

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Herbert, S. I. (1995). WKB estimates to the critical length of twisted solar coronal loops . (Thesis). University of St. Andrews. Retrieved from http://hdl.handle.net/10023/14092

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Herbert, Simon I. “WKB estimates to the critical length of twisted solar coronal loops .” 1995. Thesis, University of St. Andrews. Accessed July 03, 2020. http://hdl.handle.net/10023/14092.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Herbert, Simon I. “WKB estimates to the critical length of twisted solar coronal loops .” 1995. Web. 03 Jul 2020.

Vancouver:

Herbert SI. WKB estimates to the critical length of twisted solar coronal loops . [Internet] [Thesis]. University of St. Andrews; 1995. [cited 2020 Jul 03]. Available from: http://hdl.handle.net/10023/14092.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Herbert SI. WKB estimates to the critical length of twisted solar coronal loops . [Thesis]. University of St. Andrews; 1995. Available from: http://hdl.handle.net/10023/14092

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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