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 33 for “"ionospheric plasma"”.
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Simulation of ionospheric plasma heating experiments in the versatile toroidal facility
Remote sensing techniques employed to diagnose ionospheric modification experiments are intrinsically ambiguous, uncorrelated with "ground truth." To overcome this limitation, laboratory experiments are performed in the model ionosphere of the Versatile Toroidal Facility (VTF). The VTF contains a …
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Electrodynamic interactions between charged space systems and the ionospheric plasma environment
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1991.
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Laboratory studies of ionospheric plasma processes with the Versatile Toroidal Facility (VTF)
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1996.
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Plasma confinement optimization of the versatile toroidal facility for ionospheric plasma simulation experiments
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1991.
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An examination of ionospheric plasma irregularities detected by the mid-latitude SuperDARN radars
… developed a method for identifying periods of ionospheric backscatter that increase the number of data and reduce the average velocity in agreement with previous incoherent scatter radar (ISR) studies. Analysis of the data identified by this method clearly shows that different types of …
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A Study on Several Radar Techniques Used for the Estimation of Ionospheric Plasma Drifts
A new algorithm is developed for a faster ionospheric drift analysis instead of the line fitting method used in the original radar interferometry technique. Comparisons between the revised and the conventional radar interferometry techniques indicate a very strong match between the two methods. The …
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2-D radio imaging of equatorial ionospheric plasma depletions with the C/NOFS satellite: algorithms and results
Local depletions in the equatorial ionospheric electron density, known as spread-F events, have been an active area of scientific research in the last decades. These are of special interest to the research community because of their potentially deleterious impact on trans-ionospheric communication …
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Could global warming affect space weather? : case studies of intense ionospheric plasma turbulence associated with natural heat sources
… on observations 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 …
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A forward model for ionospheric soundings and its use with incoherent scatter radar data to obtain ionospheric plasma density profiles
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-11 without embargo terms
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A forward model for ionospheric soundings and its use with incoherent scatter radar data to obtain ionospheric plasma density profiles
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-11 without embargo terms
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Radar observations of field-aligned plasma propagations associated with NASA's PMG experiment
ASA's Plasma Motor Generator (PMG) tethered satellite mission was launched in June 1993 to verify the ability of hollow cathode plasma sources to couple electric currents from an electrodynamic tether into the ambient ionospheric plasma. This large-scale coupling process resulted in turbulent …
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Simultaneous multi-angle measurements of plasma turblence at HAARP
… (SLT) in the interaction region of overdense ionospheric plasma. Diagnostics included the Modular UHF Ionospheric Radar (MUIR) sited at HAARP, the Super DARN-Kodiak HF radar, and HF receivers to record stimulated electromagnetic emissions (SEE). Short pulse, low duty cycle experiments …
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Modeling of Polar Cap Ionospheric Patches and Attendant Plasma Instabilities: Initialization from Data and Parametric Analysis
… is a robust history of theoretical work on ionospheric plasma patches and their attendant plasma fluid irregularities, particularly within the polar cap region. Within this region though, plasma theory does not always yield tractable problems with succinct analytic solutions that are …
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Low frequency plasma waves at Mars
… eight years of observations of low frequency plasma waves produced in the interaction of the solar wind with the Martian ionosphere. Using the MAG/ER data, I identify the properties and physical origins of the waves in the magnetosheath, magnetic pileup region, and ionosphere. I find that the …
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Studies of aspect angle dependence of plasma turbulence at HAARP
… (SLT) in the interaction region of overdense ionospheric plasma. Diagnostics included the Modular UHF Ionospheric Radar (MUIR) sited at HAARP, the Super DARN-Kodiak HF radar, and HF receivers to record stimulated electromagnetic emissions (SEE). Short pulse, low duty cycle experiments …
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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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Intense spreading of radar echoes from ionospheric plasmas
On December 25, 2004, a large-scale ionospheric plasma bubble was observed over Arecibo Observatory in Puerto Rico, inducing significant range spreading on ionograms. This phenomena may be explained by means of the E x B instability and gravitational Rayleigh-Taylor instability. A derivation of the …
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Inversion of Arecibo incoherent scatter radar coded long pulse backscatter spectra
… waves from random density fluctuations of ionospheric plasma particles (electrons and ions). Information about particle temperatures, ion concentrations, and Doppler shifts caused by particle motions can be estimated by inverting the power spectra of received scatter signals to the …
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Additively Manufactured, Multi-Langmuir Probe Plasma Sensing Device for Use on CubeSats
… a Langmuir probe (LP) sensor array for CubeSat ionospheric plasma diagnostics. The ionosphere is a critical layer of Earth's atmosphere consisting entirely of plasma, and reliable in-situ measurements made on satellites orbiting within the ionosphere are necessary for better understanding its …
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Influence of Plasma Trails from Hypersonic Events on HF Radar Data Capture
… typically to create hemisphere wide maps of ionospheric plasma convection, but meteor events are attributed to noise experienced in its data. This thesis first brings together plasma physics understanding with currently available research to clarify the physical behaviors that must be …
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