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 “"Sun-Earth"”.
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Lines Drawn Between Sun + Earth
… draw inspiration from its position between the earth and sun to guide its architecture. The result of this method is evident through the following drawings and models.
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Spacecraft formation flight at sun-earth/moon libration points
… positioned near the libration points of the Sun- Earth/Moon system, have recently received an increase in interest in response to a variety of mission needs. Specifically, missions such as the Micro Arcsecond X-Ray Imaging Mission (MAXIM), Terrestrial Pathfinder (TPF), Stellar Imager (SI) and …
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Significance of Specific Force Models in Two Applications: Solar Sails to Sun-Earth L4/L5 and GRAIL Data Analysis Suggesting Lava Tubes and Buried Craters on the Moon
… incorporating solar sail dynamics, from the Earth parking orbit to the vicinity of triangular Lagrange points. Thereafter, an optimization scheme assisted in investigating the ΔV requirement to depart from the Earth parking orbit. Harnessing the solar radiation pressure, the spacecraft is …
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Promoting mental model-building in astronomy education
… to construct the scientists’ mental model of the Sun-Earth-Moon system. It used an approach suggested by Hesse (1966) in which a model is repeatedly critiqued with respect to the extent that it both represents and fails to represent the structure and properties of a mental model. The study …
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Integrated navigation architecture analysis for Moon and Mars exploration
… models around the libration point L₂ of the Sun-Earth system is also presented. The objective of this research was to assess the quality of different dynamical models of the relative motion of two spacecraft in orbit around Sun-Earth L₂.
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Constrained Motion Analysis of Spacecraft Trajectory in Restricted Three Body Problem
… the Aditya-L1 spacecraft to study about the Sun by 2021. James Webb Space Telescope has also been designed to observe deep space at L2 in the Sun-Earth system by 2021. The combined gravity of the Earth and the Sun keep satellite’s orbit locked at libration points. Though satellites enjoys an …
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Astrodynamics of the Next Generation Space Weather Prediction Mission
… becomes ever more important as our dependence on Earth orbiting spacecraft increases. Different solar wind drivers can lead both to enhancements and losses of relativistic electrons in the outer radiation belts, thus posing a major risk to satellites. To further our understanding of the Sun’s …
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Orbit and Attitude Control for (non-) Rotating Space-Based Telescopes Utilizing Reflectivity Control Devices
… has allowed for advancements in knowledge of Earth's environment, the Solar System, and the cosmos that were otherwise not possible using ground-based counterparts. It is no surprise that scientists call for advancements in telescope technology that allow for longer-lasting and larger …
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Computationally Efficient Optimization of Formation Flying Trajectories, with Solar Radiation Pressure, near Lagrange Points
… the characterization of exoplanets with Earth-like qualities requires imaging capabilities that exceed the current state of coronagraphs. An external occulter, commonly referred to as a starshade, flying in formation with a space-based telescope is a proposed solution to the …
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Observer-based event-triggered and set-theoretic neuro-adaptive controls for constrained uncertain systems
… formation flight of the microsatellites at the Sun-Earth/Moon L1 libration point. This dynamic system is selected to evaluate the performance of the ETNAC techniques in a setting that is highly nonlinear and chaotic in nature. Moreover, factors like restricted controls, response to uncertainties …
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Spacecraft Orbit Design in the Circular Restricted Three-Body Problem Using Higher-Dimensional Poincaré Maps
… involving three-dimensional trajectories in the Earth-Moon, Sun-Earth, and Uranus-Titania systems. Included in the approach is a method for representing, interpreting, and manipulating four-dimensional Poincaré maps in an interactive, three-dimensional visual environment in which the fourth …
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Information Theory Analysis of the Solar Wind Magnetic Structures for Space Weather Prediction
<p>Forecasting space weather at Earth is highly complicated, because of the limited measurements of the dynamic processes in the Sun that span multiple temporal, spatial, and energy-scales. The solar wind is a highly structured, multi-scale, evolving plasma and consists of coronal mass ejections …
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Solar Sailing Adaptive Control Around the Earth-Moon Lagrange Point L4 for Stellar Observations
… expand our knowledge about the influence of the Sun in the cislunar region, as well as our understanding of shocks due to Coronal Mass Ejections and large coronal magnetic reconnection, a solar sailing approach is proposed to separately capture lunar occultations and observe the solar corona from …
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Quantification of the spatial structure and temporal variability of Earth's exosphere using optical tomography
Knowledge of the spatial structure of Earth's exosphere, the outermost atmospheric layer, is crucial for understanding various aspects of aeronomy and heliophysics, such as atmospheric chemistry and energetics, magnetospheric energy dissipation, ion-neutral coupling, and atmospheric evolution. …
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Low-Thrust Optimal Escape Trajectories from Lagrangian Points and Quasi-Periodic Orbits in a High-Fidelity Model
L'abstract è presente nell'allegato / the abstract is in the attachment
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Safe Harbor: An Exploration in Lunar Habitation
This thesis posits the creation of a lunar settlement, examining the practical and theoretical challenges of urban design in a space environment. Analysis of the lunar environment aided by data and imagery from the Lunar Reconnaissance Orbiter allows the project to narrow focus on site selection …