Research

My research interests are varied, however mostly focused around computing and data processing. During my PhD I have focused on using high-performance computing to simulate the low solar atmosphere studying wave phenomena in magnetic structures. As well as this I have contributed to work on the automated detection and tracking of 'Ellerman Bombs' which are small brightening is the solar chromosphere. I developed a algorithm to identify and track these brightenings over time which allowed for the detailed statistical analysis of these events to be performed. I have also been involved in the processing and analysis of data from the Swedish Solar Telescope, in which evidence of upwardly propagating waves from a magnetic pore was discovered.

The primary component of the PhD research has been the development of an analysis pipeline for the identification and quantification of wave modes in my numerical simulations of the solar atmosphere. This software and other supporting tools, have been made availible on GitHub under the pysac project.

Publications

Photospheric Logarithmic Velocity Spirals as MHD Wave Generation Mechanisms Mumford, S. J. and Erdélyi, R.
Monthly Noticies of the Royal Astronomical Society - March 2015 - Volume 449 Issue 2.
Publisher Link (Open Access) | Reproduceable repository
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Generation of Magnetohydrodynamic Waves in Low Solar Atmospheric Flux Tubes by Photospheric Motions Mumford, S. J., Fedun, V., Erdélyi, R.
The Astrophysical Journal - January 2015 - Volume 799, Issue 1.
Publisher Link (Paywall)
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SunPy: Python for Solar Physics The SunPy Community, Mumford, S. J., Christe, S., Pérez-Suárez, D., Ireland, J., Shih, A. Y., Inglis, A. R., Liedtke, S., Hewett, R. J., Mayer, F., Hughitt, K., Freij, N., Meszaros, T., Bennett, S. M., Malocha, M., Evans, J., Agrawal, A., Leonard, A. J., Robitaille, T. P., Mampaey, B., Iván Campos-Rozo, J., Kirk, M. S.
Computational Science and Discovery - January 2015 - Volume 8 Issue 1.
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The Detection of Upwardly Propagating Waves Channeling Energy from the Chromosphere to the Low Corona Freij N., Scullion E. M., Nelson C. J., Mumford S. J., Wedemeyer S., and Erdélyi R.
The Astrophysical Journal - July 2014 - Volume 791, Issue 1, p.61
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Magnetohydrostatic equilibrium - I. Three-dimensional open magnetic flux tube in the stratified solar atmosphere Gent, F. A., Fedun, V., Mumford, S. J., Erdélyi, R.
Monthly Notices of the Royal Astronomical Society - October 2013 - Volume 435, Issue 1, p.689-697
Publisher Link (Paywall)
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Statistical Analysis of Small Ellerman Bomb Events Nelson, C. J., Doyle, J. G., Erdélyi, R., Huang, Z., Madjarska, M. S., Mathioudakis, M., Mumford, S. J., Reardon, K
Solar Physics - April 2013 - Volume 283, Issue 2, p.307-323.
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Conferences & Talks

This is a list off all the conferences I have attended and links to the material I presented, where applicable:

Simulations of the Solar Atmosphere

My primary research interest is the simulation and analysis of wave propagation in magnetic structures in the low solar atmosphere. This involves the use of the “Sheffield Advanced Code” a versatile code base able to simulate wave perturbations on top of any background condition. The design of this code allows for the study of comparatively small amplitude waves against the high dynamic range of the solar atmosphere. Between the solar surface (the photosphere) and the low solar corona the density of the plasma decreases by 8 orders of magnitude. Simulating wave phenomena in this kind of high gradient atmosphere, under the influence of gravity, is much easier with separate static background conditions.

My work has focused on the analysis of simulations of a single expanding flux tube stretching from the photosphere. I developed a new analysis pipeline for the fast and accurate decomposition of vector quantities in the simulations, primarily velocity and wave energy flux, into components in the frame of the magnetic field in three dimensions. To do this I utilised VTK, from Python, and created a surface from magnetic field lines and used the normal vector from this surface in addition to the magnetic field vector to compute the new reference frame.

I have used this analysis method to study the effects of wave generation in expanding flux tubes by a variety of different simulated drivers. The results of this study indicated that a wider spectra of magnetohyrodynamic wave modes are generated from broadband photospheric drivers than previously envisaged.

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