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 11 of 11 for “"Radiation belts"”.
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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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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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Analysis of LEO Radiation Environment and its Effects on Spacecraft's Critical Electronic Devices
… astronauts are exposed to an increased level of radiation when in space, and it is important to evaluate the risks associated with extended radiation exposures in missions and space travel in general. The thesis focuses on the LEO radiation environment and how the particles in it interact with …
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Incoherent scatter radar detection of enhanced plasma line in ionospheric E-region over Arecibo
… was caused by precipitated electrons from the radiation belts. The precipitated electrons will enhance the population of suprathermal electrons in the E-region. Subsequently, suprathermal electrons will cause excitation of Langmuir waves that could be detected by incoherent scatter radar as …
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Astrodynamics of the Next Generation Space Weather Prediction Mission
… losses of relativistic electrons in the outer radiation belts, thus posing a major risk to satellites. To further our understanding of the Sun’s impact on the near Earth space environment, as well as to provide predictive capabilities, a mission placing monitoring satellites in key orbits in …
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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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Circuit designs for low-power and SEU-hardened systems
… free or error immune designs. Until recently, radiation effects were a major concern in space applications only. With technology scaling reaching nanometer level, terrestrial radiation has become a growing concern. As a result Single Event Upsets (SEUs) have become a major challenge to robust …
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An experimental and graph theoretic study of atomic layer deposition processes for spacecraft applications
… interaction with charged particles in Van Allen radiation belts. To this aim a specialized ALD reactor was designed and constructed capable of processing standard flat substrates as well as coating micron-sized particles. The results confirm that the proposed process can be used to coat the heat …
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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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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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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 …