Investigating the Magnetospheric Dynamics of Quadrupole Magnetic Fields: Applications to Geomagnetic Reversals and Ice Giant Magnetospheres

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dc.contributor.advisorPaty, Carol
dc.contributor.authorCaggiano, Joseph
dc.date.accessioned2024-01-10T14:23:57Z
dc.date.issued2024-01-10
dc.description.abstractPlanetary magnetic fields in our Solar System exhibit a wide range of configurations, from unmagnetized Venus and Mars to the complex dipole magnetic fields of Uranus and Neptune. This dissertation investigates the influence of magnetic quadrupoles on magnetospheric dynamics, particularly in the inner magnetosphere, where quadrupole fields are the strongest. Studying the impact of quadrupole magnetic fields is essential for understanding the ice giant magnetosphere systems and for anticipating the effects of Earth's geomagnetic reversal events, which could reduce the longevity of satellites in orbit around Earth, and enhance radiation in the atmosphere, potentially deplete the ozone layer and increase the presence of harmful compounds in the troposphere. Using analytical and multi-fluid magnetohydrodynamic (MHD) models, this dissertation examines how a quadrupole magnetosphere behaves differently from a dipole magnetosphere in the context of Earth during a pole reversal and how a strong quadrupole moment can affect plasma dynamics in ice giant planets like Uranus. The research demonstrates the nature of magnetospheric convection within a quadrupole-dominated magnetosphere and how a quadrupole lacking rotational symmetry can displace plasma in the inner magnetosphere. This may have consequences for a society heavily reliant on technology during pole reversal events. These findings are novel and contribute to the understanding of magnetospheric behavior during a pole reversal, potentially helping to assess the effects on satellites, power grids, and overall health. Additionally, this research may guide observations for the upcoming Uranus Orbiter and Probe mission and future missions to ice giant systems.en_US
dc.description.embargo2024-07-26
dc.identifier.urihttps://hdl.handle.net/1794/29221
dc.language.isoen_US
dc.publisherUniversity of Oregon
dc.rightsAll Rights Reserved.
dc.subjectGeomagnetic Reversalsen_US
dc.subjectIce Giantsen_US
dc.subjectMagnetic Quadrupolesen_US
dc.subjectMagnetohydrodynamicsen_US
dc.subjectMagnetospheresen_US
dc.subjectQuadrupole Magnetospheresen_US
dc.titleInvestigating the Magnetospheric Dynamics of Quadrupole Magnetic Fields: Applications to Geomagnetic Reversals and Ice Giant Magnetospheres
dc.typeElectronic Thesis or Dissertation
thesis.degree.disciplineDepartment of Geological Sciences
thesis.degree.grantorUniversity of Oregon
thesis.degree.leveldoctoral
thesis.degree.namePh.D.

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