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ENERGY BALANCE IN THE CORE OF THE SATURN PLASMA SHEET
by
Jean Michi Yoshii
A Dissertation Presented to the
FACULTY OF THE USC GRADUATE SCHOOL
UNIVERSITY OF SOUTHERN CALIFORNIA
In Partial Fulfillment of the
Requirements for the Degree
DOCTOR OF PHILOSOPHY
(AEROSPACE ENGINEERING)
December 2011
Copyright 2011 Jean Michi Yoshii
Object Description
| Title | Energy balance in the core of the Saturn plasma sheet |
| Author | Yoshii, Jean Michi |
| Author email | yoshii@usc.edu;jmyoshii@spacenvironment.net |
| Degree | Doctor of Philosophy |
| Document type | Dissertation |
| Degree program | Aerospace Engineering |
| School | Viterbi School of Engineering |
| Date defended/completed | 2011-08-16 |
| Date submitted | 2011-10-03 |
| Date approved | 2011-10-04 |
| Restricted until | 2012-10-03 |
| Date published | 2012-10-03 |
| Advisor (committee chair) | Shemansky, Donald E. |
| Advisor (committee member) |
Muntz, E. Phillip Judge, Darrell L. Kunc, Joseph A. Erwin, Daniel A. |
| Abstract | This dissertation presents a gas phase water chemistry model of the inner Saturn magnetosphere. Detailed calculations of the plasma sheet electron energy balance establish, for the first time, a direct relation between the forcing energy deposition into the plasma sheet and the state of the ambient plasma sheet electrons. ❧ The two-part model comprises a chemistry code and an energy balance calculation. The chemistry code, coreqg.f90, iteratively solves chemistry rate equations for the thirteen ion and neutral species (H₂O, H₂O⁺, H, H⁺, O, O+, H₂, H₂⁺, O₂, O₂⁺, OH, OH⁺, and H3O+) included in the system. The water chemistry architecture file used by coreqg.f90 completely describes each reaction by specifying the reactant and product species and supplying the collision strength data used to calculate rate coefficients for the chemistry. The input parameter space for the code consists of the number densities and temperatures for the plasma sheet electrons, the heterogeneous electrons, and the selected source species, H₂O and H. ❧ The energy balance calculation operates on the chemistry code outputs and determines the net energy rate for the plasma sheet electrons. Curves for the net plasma sheet electron energy rate vs. input plasma sheet electron temperature, as a function of heterogeneous electron density, are presented. Energy equilibrated plasma sheet electron temperature and gas species partitioning are determined at net zero plasma sheet electron energy rate. ❧ The role played by the Saturn atmospheric heterogeneous hydrogen in maintaining the observed neutral-dominated magnetospheric gas is investigated. The water source rate and energy deposition rate required to maintain the gas at the location of Enceladus (4 Saturn radii (Rs) from Saturn center) are evaluated. Energy relaxation lifetimes for neutral and ion gas species are also determined. Comparison of the model against observation shows basic agreement for the core of the plasma sheet. ❧ The chemistry code input and output files used in the data analysis and plots in this dissertation (plasma sheet electron densities = 50.0, 75.0, and 100.0 cm⁻³) are archived as supplementary files. |
| Keyword | Saturn; Enceladus; plasma sheet core; inner magnetospheric chemistry model; energy balance in the inner magnetoshpere; atmospheric hydrogen flux; plasma chemistry model; plasma sheet electrons; water chemistry |
| Language | English |
| Part of collection | University of Southern California dissertations and theses |
| Publisher (of the original version) | University of Southern California |
| Place of publication (of the original version) | Los Angeles, California |
| Publisher (of the digital version) | University of Southern California. Libraries |
| Provenance | Electronically uploaded by the author |
| Type | texts |
| Legacy record ID | usctheses-m |
| Rights | Yoshii, Jean Michi |
| Access conditions | The author retains rights to his/her dissertation, thesis or other graduate work according to U.S. copyright law. Electronic access is being provided by the USC Libraries in agreement with the author, as the original true and official version of the work, but does not grant the reader permission to use the work if the desired use is covered by copyright. It is the author, as rights holder, who must provide use permission if such use is covered by copyright. The original signature page accompanying the original submission of the work to the USC Libraries is retained by the USC Libraries and a copy of it may be obtained by authorized requesters contacting the repository e-mail address given. |
| Repository name | University of Southern California Digital Library |
| Repository address | USC Digital Library, University of Southern California, University Park Campus MC 7002, 106 University Village, Los Angeles, California 90089-7002, USA |
| Repository email | cisadmin@usc.edu |
| Archival file | uscthesesreloadpub_Volume71/etd-YoshiiJean-310.pdf |
Description
| Title | Page 1 |
| Full text | ENERGY BALANCE IN THE CORE OF THE SATURN PLASMA SHEET by Jean Michi Yoshii A Dissertation Presented to the FACULTY OF THE USC GRADUATE SCHOOL UNIVERSITY OF SOUTHERN CALIFORNIA In Partial Fulfillment of the Requirements for the Degree DOCTOR OF PHILOSOPHY (AEROSPACE ENGINEERING) December 2011 Copyright 2011 Jean Michi Yoshii |
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