Investigating the Magnetospheric Dynamics of Quadrupole Magnetic Fields: Applications to Geomagnetic Reversals and Ice Giant Magnetospheres
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Date
2024-01-10
Authors
Caggiano, Joseph
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Publisher
University of Oregon
Abstract
Planetary 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.
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Keywords
Geomagnetic Reversals, Ice Giants, Magnetic Quadrupoles, Magnetohydrodynamics, Magnetospheres, Quadrupole Magnetospheres