Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 13 of 13 for “"geospace"”.
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Effects of solar particle events on Geospace
… deposit their magnetic and kinetic energy within geospace (defined herein as 'that which is within the magnetopause'). A survey of the solar energetic particle (SEP) events and trans-equatorial coronal holes occurring during solar cycles 19 to 23 confirmed that the cumulative frequency of SEP …
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Radio and optical studies of natural and artificially stimulated geospace plasmas
… of natural and artificially enhanced geospace plasmas are presented. Firstly, naturally occurring plasma phenomena was studied by means of the radio and optical ground-based instruments and the results are compared with the in-situ satellite measurements. Observations of auroral …
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Extreme Ultraviolet Airglow Observations and Applications from the Ionospheric Connection Explorer
… of these regions is critical to understanding geospace. The Ionospheric Connection Explorer (ICON), launched in 2019, sought to establish the effects of forcing on the ionosphere and thermosphere from below and above, in part by using observations of ultraviolet airglow, which have long been …
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The Optimum Design of a Vacuum-Compatible Manipulator to Calibrate Space Based Ultraviolet Imagers
<p>Recent discoveries in geospace science have necessitated the design of compact UV imaging instruments to make space-based observations from multiple vantage points. The miniaturized ultraviolet imager (MUVI) instrument from the Space Sciences Laboratory (SSL) at UC Berkeley is under development …
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Exploring the Soil-Plant-Atmosphere Continuum: Advancements, Integrated Modeling and Ecohydrological Insights
… processes into a novel ecohydrological model, GEOSPACE-1D (Soil Plant Atmosphere Continuum Estimator model in GEOframe). Through a combination of theoretical exploration, engineering methodologies, and empirical experiments, this thesis aims to advance our understanding of SPA interactions. The …
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Energetic particles in the earth's magnetospheric cusps
… connected to a number of other regions in geospace, plasma heating in this region could be a significant contributor to magnetospheric dynamics. The goal of this thesis is to answer the question, what is the source of the energetic particle population in the cusp? Since the initial …
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Development of a Multifluid Magnetohydrodynamic Model for Anisotropic, Partially Ionized Plasmas
… then applied to the solution of the well-known Geospace Environmental Modelling (GEM) challenge problem involving magnetic field reconnection and numerical results are compared to established solutions in the literature. Results of grid refinement and parametric studies for the GEM case are also …
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Solar Wind-Magnetosphere-Ionosphere Coupling: Multiscale Study with Computational Models
… and those properties are vastly different across geospace regions. It is highlighted that SW-M-I coupling could be significantly influenced by both microscopic and macroscopic processes. In order for a comprehensive understanding of the SW-M-I coupling, multiscale models and integrated framework …
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Embodied Data Exploration in Immersive Environments: Application in Geophysical Data Analysis
… immersive analytics environment using real-world geospace science datasets and assessed the benefits and drawbacks of using sonification in an immersive analytics setting.
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Solar wind entry into the magnetosphere under northward IMF conditions
… data. The model used here is the Open Global Geospace Circulation Model (OpenGGCM), which is a magnetosphere MHD model with a stretched grid that has higher grid resolution near the Earth. The simulation is driven by the upstream solar wind input. I run simulations for several CDPS events to …
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Radio Propagation Through Density Irregularities in the Auroral Ionosphere
… Model (CSM), and plasma-based density model Geospace Environment Model of Ion-Neutral Interactions (GEMINI), to simulate the radio wave scintillation through ionospheric density irregularities. SIGMA simulates a GPS signal propagated through a phase screen from a moving satellite to the …
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High Frequency Radio Wave Transionospheric Propagation Polarization Studies from the RRI-SuperDARN Experiment
The enhanced Polar Outflow Probe (ePOP) launched in September 2013 is the fifth Canadian satellite designed for space science observations. One of the 8 instruments it carries is the Radio Receiver Instrument (RRI) which is a passive cross-dipole radio observation instrument. The RRI detects …
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Kinetic Modeling of Ionospheric Outflows Observed by the VISIONS-1 Sounding Rocket
<p>Plasma escape from the high-latitude ionosphere (ion outflow) serves as a significant source of heavy plasma to magnetospheric plasma sheet and ring current regions. Outflows alter mass density and reconnection rates, hence global responses of the magnetosphere. The VISIONS-1 (VISualizing Ion …