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 16 of 16 for “"radiation belt"”.
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Earth's outer electron radiation belt : sources, losses and predictions
The outer electron radiation belt is highly dynamic in space and time. Understanding the mechanisms that drive these variations is of high interest to the scientific community because of the negative effects that the radiation belt can have on satellite instrumentation. Evidence in support of a …
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Development and Application of Stochastic Methods for Radiation Belt Simulations
This thesis describes a method for modeling radiation belt electron diffusion, which solves the radiation belt Fokker-Planck equation using its equivalent stochastic differential equations, and presents applications of this method to investigating drift shell splitting effects on radiation belt …
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Electron transport, acceleration and loss in Earth's outer radiation belt
Earth's radiation belts are comprised of high energy charged particles trapped by Earth's magnetic field. The outer radiation belt is highly variable, with the trapped electron flux varying by orders of magnitude on timescales of hours. The radiation belts are a hazard for satellite operations as …
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Applications of an electrostatic high-voltage tether to radiation belt remediation
A computational algorithm is developed and executed to calculate the rate of depletion of magnetospheric ions by an electrostatic tether at various altitudes. This computation relies upon past studies in the OML regime of charged tethers to determine the deflection angles incurred upon incoming …
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Modeling of Outer Radiation Belt Electron Scattering due to Spatial and Spectral Properties of ULF Waves
… (0.5-10 MeV) electrons in Earth's outer radiation belt (r = 3-7 RE, or L-shells: L = 3-7) interacting with magnetospheric Pc-5 (ULF) waves. This dissertation focuses on ideal models for short and long term electron energy and radial position scattering caused by interactions with ULF …
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Energetic electron dynamics in the outer Van Allen radiation belt during sheath regions driven by interplanetary coronal mass ejections
… field. These energetic particles in the Earth’s radiation belts are important to understand because they pose a significant threat for satellites. However, which physical processes – such as acceleration, scattering loss or radial diffusion – dominate the radiation belt response to a given solar …
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Electron acceleration and loss caused by wave-particle interactions in the Van Allen radiation belts
… time in the harsh environment of the Van Allen radiation belts. The radiation belts are usually split into two regions, the inner and the outer radiation belt. While the inner belt is considered stable, the flux of electrons in the outer belt can vary over several orders of magnitude, reaching …
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Investigation of Particle Trajectories in the Near-Earth Night-Side Magnetosphere Using Riometers
… inner magnetosphere play an important role in radiation belt and ring current dynamics. Injections have historically been studied primarily by data from particle detectors on satellites, causing gaps in our knowledge because these events are spatially large and highly structured and satellites …
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Controlled precipitation of energetic Van Allen belt protons by electromagnetic ion cyclotron (EMIC) waves : scientific and engineering implications
The inner Van Allen radiation belt traps highly energetic protons sourced from solar storms, cosmic rays and other processes. These particles can rapidly damage the space systems orbiting the inner region, limiting access to Low Earth Orbit (LEO). Decades of modeling and observations, however, show …
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Understanding how low energy electrons control the variability of the Earth's electron radiation belts
The electron radiation belts are regions of geomagnetically trapped electrons, surrounding the Earth, presenting hazards to operational satellites. On the timeframe of hours, both the energy and particle flux of the radiation belts can change by orders of magnitude. Variations in the high energy …
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Radiation of VLF/ELF waves from a magnetospheric tether
The high energy particles of the Van Allen belts coming from cosmic rays, solar storms, high altitude nuclear explosions (HANEs) and other processes represent a significant danger to humans and spacecraft operating in those regions, as well as an obstacle to exploration and development of space …
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Numerical Simulation of Ion-Cyclotron Turbulence Generated by Artificial Plasma Cloud Release
… Alfven waves for applications to scattering radiation belt particles is discussed.
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Innovative Methods for LEO Particle Experiments]{Innovative Methods and Instrumentation for Low-Energy Particle Experiments in Low-Earth Orbit Space Mission Analysis and Hardware R&D across the NUSES, CSES-Limadou and SPaRKLE Projects
… uncertainty in the measurement chain, from radiation–matter interactions, through digitisation strategies, to onboard algorithmic processing, must be understood and controlled. Space imposes an additional layer of complexity: the Low-Earth Orbit (LEO) environment subjects instruments to …
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Modelling the Exposure of Satellites in Medium Earth Orbit to Proton Belt Radiation
… trapped protons forming Earth's proton radiation belt pose a hazard to orbiting spacecraft. In particular, solar cells are prone to degradation caused by non-ionising collisions with protons in the energy range of several megaelectron volts, which can ultimately shorten the lifespan of a …
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A statistical study of plasmawaves and energetic particles in the outer magnetosphere
… magnetosphere by energizing electrons to form a radiation belt, extracting energy from the hot, anisotropic ions and causing pitch angle scattering of energetic ions and relativistic electrons into the loss cone. EMIC waves correspond to the highest frequency waves in the ultra-low frequency …
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Sensing impacts to the Earth-ionosphere waveguide from terrestrial and space weather
… solar processes. Solar flares and precipitating radiation belt particles enhance low-altitude ionization, causing communication blackouts, and generating ozone-destroying radicals in the mesosphere. In order to quantify the global impacts of solar flare ionization and energetic electron …