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 “"sunspot"”.
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Modeling and prediction of sunspot cycles
Solar activity, as indexed by sunspots, has a cycle of length varying from about 9 to 13 years. Statisticians have fitted several models to predict sunspot numbers one year ahead. We instead focus on predicting the magnitudes of the next cycle maximum, the next cycle minimum, the time from the …
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The Impact of Sunspot Rotation on Solar Flares
… This thesis aims to determine whether sunspot rotation can inject the energy required for solar flares into the corona. This thesis investigates the relationship between sunspot rotation and solar flares, and the impact that sunspot rotation has on the strength and frequency of flare …
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Engineering System Design for Automated Space Weather Forecast. Designing Automatic Software Systems for the Large-Scale Analysis of Solar Data, Knowledge Extraction and the Prediction of Solar Activities Using Machine Learning Techniques
… CMEs originate. Studying the associations among sunspot groups, flares, filaments, and CMEs is helpful in understanding the possible cause and effect relationships between these events and features. Forecasting space weather in a timely manner is important for protecting technological systems and …
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Engineering System Design for Automated Space Weather Forecast. Designing Automatic Software Systems for the Large-Scale Analysis of Solar Data, Knowledge Extraction and the Prediction of Solar Activities Using Machine Learning Techniques.
… CMEs originate. Studying the associations among sunspot groups, flares, filaments, and CMEs is helpful in understanding the possible cause and effect relationships between these events and features. Forecasting space weather in a timely manner is important for protecting technological systems and …
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High resolution studies of complex solar active regions
… regions. The most violent events are produced in sunspots with a complex magnetic field topology. Studying their morphology and dynamics is helpful in understanding the energy accumulation and release mechanisms for flares and CMEs, which are intriguing problems in solar physics. The study of …
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Development of digital imaging technologies for the segmentation of solar features and the extraction of filling factors from SODISM images
… to improve the monitoring of features, such as sunspots and the prediction and diagnosis of solar activity. In proportion to the available raw material, the little-published analysis of SODISM data has provided the impetus for this study, specifically a novel method of contributing to the …
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Automated Prediction of Solar Flares Using SDO Data. The Development of An Automated Computer System for Predicting Solar Flares Based on SDO Satellite Data Using HMI Images Analysis, Visualisation, and Deep Learning Technologies
… stored in twisted magnetic fields, usually near sunspots, is suddenly released. Yet, their occurrence is not fully understood. These flares can affect the Earth by the release of massive quantities of charged particles and electromagnetic radiation. Investigating the associations between solar …
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Automated Prediction of Solar Flares Using SDO Data. The Development of An Automated Computer System for Predicting Solar Flares Based on SDO Satellite Data Using HMI Images Analysis, Visualisation, and Deep Learning Technologies
… stored in twisted magnetic fields, usually near sunspots, is suddenly released. Yet, their occurrence is not fully understood. These flares can affect the Earth by the release of massive quantities of charged particles and electromagnetic radiation. Investigating the associations between solar …
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Theoretical studies of the mid-latitude ionosphere
… The time-dependent behaviour of He+ under sunspot minimum conditions is investigated in Chapter IV. This is achieved by numerical solution of the 0+, H+ and,He+ continuity and momentum equations, treating He+ as a minor ion with 0+ , H+ as major ions. We found that He+ flows upwards during …
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The 3-D topology of magnetic fields in and around sunspots
… on the surface of the solar disc are the sunspots, which have been studied since their detection in the 17th century. Despite this years and centuries of scientific investigations, surprisingly many facets of sunspots are not well understood. In this thesis, the properties of a sunspots' …
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Extrinsic uncertainty, ergodic chaos and monetary policy in two intertemporal economic models
… existence of extrinsic uncertainty also known as sunspots is analysed within the framework of a single commodity two-period pure exchange over lapping generations model. Transversality techniques are utilised to show that extrinsically uncertain equilibria are locally generic in the space of …
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Design and application of near infrared tunable filter for ATST and NST
… the narrowband continuum observation of a Sunspot at 1.56 um using IRIM instruments, and the coronal hole observation using the Digital Vector Magnetograph (VMG) at Big Bear Solar Observatory (BBSO). A near infrared tunable filter system is designed with detailed optical parameters for each …
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Price formation under uncertainty
… beliefs is however tempered by a review of Sunspot theory that show that it is not necessary to abandon the rational expectations hypothesis in order for competitive markets to be subject to speculative fluctuations that are driven by expectations. This analysis is reinforced by a known …
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High resolution observations of magnetohydrodynamic shocks in the solar atmosphere
… reveals elusive magnetohydro-dynamic shocks in sunspot umbrae. Inversion techniques are employed to uncover perturbations in the temperatures, line-of-sight velocities, and vector magnetic fields occurring across a range of optical depths synonymous with the shock formation. Classification of …
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A near-infrared filter system and study of solar umbral dots at 1.6 µm
… include two sequences of images of a complicated sunspot and a simple sunspot. The dynamic motion properties of umbral dots are studied from the movies of the two sunspots. From the data analysis, the contrast distribution, size distribution and lifetime of umbral dots are presented.
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The Structure and Dynamic nature of the Solar Atmosphere
… the 3-min band are observed above the umbra of a sunspot active region. These oscillations show two closely separated frequencies of 6.1 & 7.1 mHz in the chromosphere, 5.9 & 7.3 mHz in the transition region and 5.9 & 7.3 mHz in the corona. These observations are interpreted as …
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Equilibria in overlapping generations models
… the question concerning the likelihood of sunspot equilibria. Within the specified framework it is impossible to explain how the economy arrives at such equilibria; it is only possible to identify the conditions that maintain (once they exist) these self-fulfilling prophecies.
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Bootstrap methods and parameter estimation in time series threshold modelling
… data covering the period (182-1934); and the sunspot numbers covering the period (1700- 1920), are attempted. The cyclical behaviours of bootstrap models are also examined. Finally, in chapter 5, an attempt is also made to study the problem of non-linear properties of the skeleton of a …
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Essays on self-fulfilling expectations and business cycles
… Furthermore, the model economy in which only sunspot shocks matter performs at least as well as a standard real business cycle model driven by technology shocks in replicating major U.S. business cycle facts and it outperforms the real business cycle model in some other dimensions. The second …
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The design of an intelligent parking system using wireless sensor networks and multi-protocol label switching
… parking system built around a new generation of SUNspot motes, the study demonstrates how a real life smart parking iv system can be deployed to benefit motorists in today's busy World and serves as a foundation to future work on how this emerging generation of motes can be used to provide better …
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