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 20 of 29 for “"Space Plasma"”.
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Interactive visualization framework for space plasma data sets
… to graphs is imperative to our understanding of space physics. However, traditional visualization tools used in the space science community are either proprietary, lack portability or require paid license subscriptions. Therefore we are attempting to resolve these shortcomings by developing …
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Simulation and Optimization of ESA Designs for Space Plasma Missions
… (2πTA) of Young, et al., [1988], and the Hot Plasma Composition Analyzer (HPCA) to be used in the upcoming Magnetospheric Multi-scale (MMS) mission. The strong agreement between simulation and experimental results verifies the accuracy of this technique. Our results reveal detailed properties …
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Dynamics of an Electrodynamic Tether System in a Varying Space-Plasma Environment
… in the fields of satellite propulsion and space plasma research. The fundamental purpose of this dissertation is to improve the understanding of the behavior of an electrodynamic tether (EDT) system in Earth's ionosphere. An electrodynamic tether system consists of two satellites connected …
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Validation and Characterization of a Laboratory Ion Source for Testing Thermal Space-Plasma Instruments
Prior to launch, space craft instruments need to be tested in a relevant environment to prove operational functionality. Thus, we have developed an ion source to stimulate thermal plasma instruments in a vacuum chamber. This dissertation presents the mechanical design of the source, simulations of …
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Excitation of forced ion acoustic waves, large plasma sheets, and magnetic field fluctuations over Gakona, Alaska
… waves", and (2) "simultaneous excitation of plasma density fluctuations and geomagnetic field fluctuations" are reported in my M.S. thesis. The data was acquired in our experiments conducted at Gakona, Alaska from summer 2007 to winter 2008, using DoD/NSF-funded HAARP facilities and our own …
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Solar Wind-Magnetosphere-Ionosphere Coupling: Multiscale Study with Computational Models
… different computational models that characterize space plasma dynamics on distinct spatial/temporal scales. These models are used to explore three important aspects of SW-M-I coupling. A particle-in-cell (PIC) model has been developed to explore the kinetic scale dynamics associated with the …
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Testing the Re-designed SuperDARN HF Radar and Modeling of a Twin Terminated Folded Dipole Array
… of researchers interested in Earth's near-space plasma environment. This group uses high frequency (HF) radars and backscatter from magnetic field-aligned plasma irregularities to study space weather manifested in the Earth's magnetosphere and ionosphere. Space weather impacts many …
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Characterization of a Magnetically Contained Hot Filament Plasma Source with a Wide-Sweeping Langmuir Probe
<p>Ionospheric plasma research in the Space and Atmospheric Instrumentation Laboratory’s Space Plasma Chamber has been hindered by the lack of a suitable plasma diagnostic instrument and understanding of its hot-filament plasma source. This thesis describes efforts made to remedy both problems. A …
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A Framework for Validation and Testing of a CubeSat Retarding Potential Analyzer
… with a hot-filament ion source simulating the space plasma verifies the function of the LAICE RPA sensor and electronics, as well as the software control, thus qualifying the instrument for on-orbit use.
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Excitation of Langmuir wave turbulence in high-frequency (HF) pump waves over Gakona, Alaska
… decay instability (PDI) in high-frequency space plasma heating experiments conducted at the NSF/DoD High Frequency Active Auroral Research Program (HAARP) facility in Gakona, Alaska during the spring and summer of 2006. The PDI is the decay of an electromagnetic (EM) wave into an electron …
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Immersed Finite Element Particle-In-Cell Modeling of Surface Charging in Rarefied Plasmas
… charging is a fundamental interaction process in space plasma engineering. A three-dimensional Immersed Finite Element Particle-In-Cell (IFE-PIC) method is developed to model surface charging involving complex boundary conditions. This method extends the previous IFE-PIC algorithm to explicitly …
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The effects of inductive electric field on the dynamics of terrestrial inner magnetosphere
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-03-28 without embargo terms
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Nonlinear Evolution of Mirror Instability in the Earth's Magnetosheath in PIC Simulations
… in the magnetosheath and they are generated in space plasma environments with proton temperature anisotropy of larger than one. The proton temperature anisotropy also drives the proton cyclotron instability which has larger linear growth rate than that of the mirror instability. Linear …
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A study of dusty plasma environment
Future space explorations emphasize the need to understand the space environment in particular the effect they pose on crews and space-bound vehicles. One of such environment is the dusty plasma environment, where fine particles can be found in abundance. Dust particles interact with space plasma, …
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Could global warming affect space weather? : case studies of intense ionospheric plasma turbulence associated with natural heat sources
… of a series of highly-structured ionospheric plasma turbulence over Arecibo on the nights of 22/23 and 23/24 July, 2006. Incoherent scatter measurements by Arecibo radar, airglow measurements using MIT PSFC's all-sky imaging system (ASIS), together with TEC measurements from GPS satellite …
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Langmuir Probe Instrument Suite for Mesosphere Turbulence Experiment Mission
… probe technique is the predominant in-situ plasma diagnostic technique, and is arguably the only measurement technique that is universally own on every sounding rocket investigation. Earth's mesosphere region (80-120 km) is a host of many dynamic phenomena such as the noctilucent clouds, …
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Conductivity Modulation of Magnetosphere-Ionosphere Coupling
… of an energetic and electromagnetically reactive plasma. This region plays an important role in over-the-horizon and satellite radio communications, satellite orbits, and can electrically couple into human infrastructure like pipelines and power cables. Activity in the ionosphere is tightly …
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Study of Narrow-Band Spectral Characteristics of Stimulated Electromagnetic Emission (SEE) During Second Electron Gyro-Harmonic Heating
… provide important diagnostic information about space plasma composition, energetics, and dynamics during active experiments in which ground-based high powered radio waves are transmitted into the ionosphere. The nonlinear plasma processes producing this secondary radiation are not well …
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Cold plasma-induced quality changes in foods and beverages and plasma’s potential use in space exploration
The long duration and extreme environment of space missions have led to significant challenges (weight loss and food aversion) in providing sustenance for astronauts. Traditional treatments that extend the shelf-life of food are often synonymous with reduced sensorial quality. Furthermore, future …
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