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 19 of 19 for “"Coronal Mass Ejections (CMEs)"”.
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Dynamics of filaments, flares and coronal mass ejections (CMEs)
… such as filament eruptions, flares, the coronal mass ejections (CMEs), the core of so-called solar activity, and the properties of the associated magnetic field for the development of forecasts of solar activity and space weather. Both statistical and case studies have been carried out. …
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A comprehensive study of evolution of photospheric magnetic field and flows associated with solar eruptions
… magnitude. For seven events associated with coronal mass ejections (CMEs), the CME mass is estimated using the observed CME velocity and the impulse provided by the upward Lorentz force. Furthermore, the flow field vorticity of selected sunspots away from flare kernels in the AR 11158 is …
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High resolution solar observations in the context of space weather prediction
… on the upper level atmosphere is discussed. Coronal Mass Ejections (CMEs) have a great impact on space weather. To study the relationship between CMEs and filament disappearance, a list of 431 filament and prominence disappearance events has been compiled. Comparison of this list with CME …
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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
Coronal Mass Ejections (CMEs) and solar flares are energetic events taking place at the Sun that can affect the space weather or the near-Earth environment by the release of vast quantities of electromagnetic radiation and charged particles. Solar active regions are the areas where most flares 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.
Coronal Mass Ejections (CMEs) and solar flares are energetic events taking place at the Sun that can affect the space weather or the near-Earth environment by the release of vast quantities of electromagnetic radiation and charged particles. Solar active regions are the areas where most flares and …
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Low coronal signatures of coronal mass ejections: coronal “waves” and dimmings
Coronal mass ejections (CMEs) are vast eruptions of magnetised plasma that explode from the solar atmosphere. This thesis focuses on understanding the nascent stages of CMEs, and their magnetic development as they expand into the interplanetary space of our solar system. This is an important part …
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Effect of Interplanetary Shock Impact Angle on the Occurrence Rate and Properties of Pc5 Waves Observed by High-Latitude Ground Magnetometers
… of a variety of solar events including both Coronal Mass Ejections (CMEs) and Co-rotating Interaction Regions (CIRs). They have the ability to move the magnetopause, the boundary between the Earth's magnetosphere and the surrounding plasma, leading to ionospheric current systems and an …
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Automatic prediction of solar flares and super geomagnetic storms
… many harmful effects on Earth. Solar flares and Coronal Mass Ejections (CMEs) are believed to be the major causes of geomagnetic storms. Thus, establishing a real time forecasting method for them is very important in space weather study. The topics covered in this dissertation are: the …
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Particle acceleration at null-point current sheets in the solar corona
… in the solar corona include solar flares and coronal mass ejections (CMEs), which can have a significant effect on Earth’s orbital infrastructure. Learning how non-thermal energy is built-up, stored and released in the corona is crucial for understanding and predicting these events. There are …
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The development of automatic and solar imaging techniques for the accurate detection, merging, verification and tracking of solar filaments
… and it is thought that they are associated with coronal mass ejections (CMEs). Filament disappearances are generally monitored by observing and analysing successive solar H-alpha images. After filament regions are obtained from individual H-alpha images, a NN classifier is used to categorize the …
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High resolution studies of complex solar active regions
Flares and Coronal Mass Ejections (CMEs) are energetic events, which can even impact the near-Earth environment and are the principal source of space weather. Most of them originate in solar active regions. The most violent events are produced in sunspots with a complex magnetic field topology. …
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False Alarms in the Forecasting of Solar Energetic Particle Events
… by high-energy events in the Sun's corona: coronal mass ejections (CMEs) with high speed, solar flares with high peak emission in soft X-rays, or a combination of the two. SEPs, however, are not detected following all fast CMEs or intense flares. Those large solar events, which might …
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Investigating our dynamic solar corona from near Sun to 1 AU
… interest in solar physics: the propagation of coronal mass ejections (CMEs); and the heating and thermal evolution of coronal loops. In our study of CMEs, two separate techniques are employed to derive the three-dimensional (3-D) position angles and kinematic profiles of three separate CME …
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Small and large-scale magnetic fields involved with solar flares
… Moreton waves, type II and III radio bursts, and coronal mass ejections (CMEs). Statistical studies were carried out for microflares and the evolution of flare core fields. Large-scale activity was analyzed by examining two major eruptions, the 2003 October 29 X10 flare and the 2005 May 13 M8.0 …
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Characterization and Modeling of Solar Flare Effects in the Ionosphere Observed by HF Instruments
… such as solar flares, radiation storms, coronal mass ejections (CMEs), alter the state of the ionosphere, a phenomenon known as Sudden Ionospheric Disturbance (SID), that can severely disrupt HF radio communication links by enhancing radiowave absorption and altering signal frequency and …
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Evolution of 3-d magnetic topology in flare-productive active regions
Solar eruptive phenomena, such as flares and coronal mass ejections (CMEs), derive their energy from complex magnetic fields and are the principal source of disturbances that affect space weather. Although physical mechanism and dynamic morphology of flares have been a subject of intense research, …
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Study of magnetic helicity in solar active regions and its relationship with solar eruptions
… in the solar atmosphere such as solar flares and coronal mass ejections (CMEs) occur in solar active regions with complex magnetic structures. The magnetic complexity is quantified in terms of twists, kinks, and interlinkages of magnetic field lines. Magnetic helicity has been recognized as a …
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New facet of solar activities revealed by high-resolution imaging at he i 10830 Å
… activities such as major flares and associated coronal mass ejections (CMEs), have a great impact on space weather, which requires us to develop the ability to predict them. Despite the extensive studies already made, however, many basic processes, such as energy accumulation processes in solar …
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Information Theory Analysis of the Solar Wind Magnetic Structures for Space Weather Prediction
… multi-scale, evolving plasma and consists of coronal mass ejections (CMEs), stream interaction regions (SIRs), expanding flux tubes (Borovsky, 2008), and interplanetary magnetic field (IMF) discontinuities and fluctuations. The aim of this research is to improve our understanding of the …