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 9 of 9 for “"ion acoustic wave"”.
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Excitation of Langmuir wave turbulence in high-frequency (HF) pump waves over Gakona, Alaska
… Investigated in this thesis are the excitation and observation of Langmuir wave turbulence caused by the parametric 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, …
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Slow wave ion heating and parametric instabilities in the HELIX helicon source
… the mechanism responsible for intrinsic ion heating in helicon sources. Two possible mechanisms have been identified: ion Landau damping of the slow wave and parametrically driven instabilities. Consistent with ion Landau damping of the slow wave, the perpendicular ion temperatures 35 cm …
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Investigations of the cascade of Langmuir wave turbulence over HAARP Observatory in Gakona, Alaska
… investigates the cascade lines from Langmuir wave turbulence as a result of Parametric Decay Instability (PDI) in the ionosphere. This effect is studied using a high-frequency (HF) heater located at the NSF/DoD High Frequency Active Auroral Research Program (HAARP) Observatory in Gakona, …
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STABILITY OF UPGOING AURORAL ION BEAMS AT 33 R(E) (PLASMA, MAGNETOSPHERE, WAVE-PARTICLE INTERACTIONS)
… upflowing hydrogen and oxygen beams of ionospheric origin are seen at altitudes near 3.3 R(,e) in the auroral zone by the DE-1 satellite. The beam observations indicate that, in addition to bulk acceleration, substantial heating in both hydrogen and oxygen has taken place either near or …
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Investigation and characterization of single hot spot laser-plasma interactions
Control of parametric laser-plasma interactions (LPI) is essential to the success of inertial confinement fusion (ICF). Through a research collaboration with the Los Alamos National Laboratory (LANL), we have had the opportunity to participate in world-class laser-plasma experiments. The goal of …
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The Effects of Weak Collisions on Nonlinear Plasma Kinetics
… widely believed to be responsible for the generation of anomalous resistivity in reconnection layers, providing a possible mechanism for fast reconnection. The concept of Landau damping is fundamental to such wave kinetic instabilities in space, and is treated typically within the framework of the …
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Spectral studies of small-scale auroral structure and plasma instability in the high-latitude ionosphere
… spectrographic data in order to study the relationship between auroral morphology and the energy characteristics of the precipitating population. It is shown that rayed auroral structures are associated with precipitating electrons with a broad range in energy, including a significant population …
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Destabilizing Effect of Alpha Particles in a Maxwellian Plasma
Made available in DSpace on 2017-07-06T18:59:18Z (GMT). No. of bitstreams: 3 Wang_Ming-Yang_MS.pdf: 22144784 bytes, checksum: c8a569f6b7142d291941a153c9ec1d6f (MD5) Wang_Ming-Yang_MS_ABS.pdf: 493903 bytes, checksum: 33885173b26c6631d0bc255a2b9f7175 (MD5) license.txt: 4813 bytes, checksum: …
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Second Harmonic Generation Stimulated Electromagnetic Emissions during High Power High Frequency Radio Wave Interaction with the Ionosphere
The interaction of a high power, high frequency (HF) pump/electromagnetic (EM) wave transmitted from a ground-based station with the ionosphere, experiments which have been termed "ionospheric heating", produces secondary radiation known as stimulated electromagnetic emissions (SEEs). SEEs have …