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Permanent link (DOI): https://doi.org/10.7939/R31W4N
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Ultra Low Frequency Waves and their Association with Magnetic Substorms and Expansion Phase Onset Open Access
- Other title
Ultra Low Frequency Waves
Expansion Phase onset
- Type of item
- Degree grantor
University of Alberta
- Author or creator
Murphy, Kyle R.
- Supervisor and department
Dr. Ian R. Mann (Physics)
- Examining committee member and department
Dr. Christopher D. Herd (Earth and Atmospheric Sciences)
Dr. Richard R. Sydora (Physics)
Dr. Roger W. Moore (Physics)
Department of Physics
- Date accepted
- Graduation date
Master of Science
- Degree level
This thesis concerns the study of Ultra Low Frequency (ULF) waves during magnetospheric substorms. A wavelet algorithm which characterises magnetic ULF waves during substorm onset is presented. The algorithm is validated by comparing the spatial and temporal location of ULF wave onset to space-based observations of the aurora. It is demonstrated that the onset of ULF wave power expands coherently away from an ionospheric epicentre during the substorm expansion phase.
Further, a case study of the time-domain causality of magnetotail plasma flows and ULF wave Pi2 pulsations is presented. Although highly correlated, it is demonstrated that the plasma flows cannot directly drive the ground magnetic waveforms but may be indirectly linked via a common source.
Finally, results from a statistical study of ULF wave power during onset are presented. It is concluded that there is no statistical difference between historical sub-classifications of ULF waves observed during substorms.
- Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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