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 30 for “"Solar physics"”.
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Efficient finite-volume schemes for magnetohydrodynamic simulations in solar physics
… our multidimensional codes for applications from solar physics is demonstrated by simulations of magnetic fluxtubes. However, neither our new approaches nor their implementations are restricted to solar physics. Furthermore, our new limiter and the error indicator can be used for arbitrary …
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Using active contours for automated tracking of UV and EUV solar flare ribbons
Solar flare UV and EUV images show elongated bright ``ribbons'' that move over time. If these ribbons are assumed to locate the footpoints of magnetic field lines reconnecting in the corona then it is clear that studying their evolution can provide an important insight into the reconnection …
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Development and Characterization of a Fast Neutron Imaging Telescope (FNIT) for 1--20 MeV Neutrons From the Sun and Nuclear Material
… 1--20 MeV neutrons intended for applications in solar physics and nuclear security. In high-energy solar physics, detecting the presence of low energy accelerated ions in the low corona is recognized as an important goal. The surest indication of the acceleration of these particles is the …
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Software and hardware improvements for digital solar magnetograph system
Digital solar imaging systems have been widely used in solar observations. Their high resolution, high rate of image acquisition and convenience for off-line image processing have provided significant improvements to solar physics research. In this project, two digital magnetograph systems …
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Magnetic reconnection in small and large scales on the sun
Almost all solar activities observed are related to the solar magnetic field, especially the topological restructuring of magnetic fields, the so-called magnetic reconnection in solar physics. They are occurring at different scales related to various phenomena, during minimum or maximum of the …
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Automatic prediction of solar flares and super geomagnetic storms
… may produce 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 …
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Operational modelling of geomagnetic fields and geomagnetically induced currents
… modelling chain spans multiple disciplines, from solar physics through to geophysics and power engineering. Most models split the chain into sequential and separate processes. Recent approaches focus on improving accuracy in the geophysical process and in network models to a transformer level. …
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Photography, Knowledge and the South Kensington Museum
… of the Palestine Exploration Fund and the Solar Physics Observatory at the Museum. Through a case study analysing photographs of two men from the Torres Strait, Garicha and Boyguda, I show how the Museum shaped public opinion on race and science as well as art and taste. Since the 1850s, …
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Enhanced flare prediction by advanced feature extraction from solar images : developing automated imaging and machine learning techniques for processing solar images and extracting features from active regions to enable the efficient prediction of solar flares.
… impact it can have on modern societies. Solar flares are one of the major solar activities that drive space weather and yet their occurrence is not fully understood. Research is required to yield a better understanding of flare occurrence and enable the development of an accurate flare …
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Enhanced flare prediction by advanced feature extraction from solar images : developing automated imaging and machine learning techniques for processing solar images and extracting features from active regions to enable the efficient prediction of solar flares
… impact it can have on modern societies. Solar flares are one of the major solar activities that drive space weather and yet their occurrence is not fully understood. Research is required to yield a better understanding of flare occurrence and enable the development of an accurate flare …
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High resolution studies of complex solar active regions
… 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. Studying their morphology and dynamics is helpful in understanding the energy accumulation and release mechanisms for flares and CMEs, …
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Investigating our dynamic solar corona from near Sun to 1 AU
… thesis, we study two areas of high 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 …
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High resolution solar observations from first principles to applications
The expression "high-resolution observations" in Solar Physics refers to the spatial, temporal and spectral domains in their entirety. High-resolution observations of solar fine structure are a necessity to answer many of the intriguing questions related to solar activity. However, a researcher …
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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
… industries, impacting our lives. One of the main solar activities that is considered as a major driver of space weather is solar flares. Solar flares can be defined as an enormous eruption in the sun's atmosphere. This phenomenon happens when magnetic energy stored in twisted magnetic fields, …
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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
… industries, impacting our lives. One of the main solar activities that is considered as a major driver of space weather is solar flares. Solar flares can be defined as an enormous eruption in the sun's atmosphere. This phenomenon happens when magnetic energy stored in twisted magnetic fields, …
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Studies of solar white-light flares and small-scale magnetic structures observed in the near infrared
… as developed by NJIT, detailed study of solar white-light flares and small magnetic structures, such as faculae and pores, are presented in this dissertation. The investigations focus on near-infrared observations at 1.56 um, which are good proxy of the deepest layer of the solar …
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Particle acceleration at null-point current sheets in the solar corona
Energetic events 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 …
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On effective field theory of dark matter
… field theories to parametrise the higher order physics. Our goal is to determine the requirements for exclusion of such particles by direct and indirect detection. In part~\ref{part:1}, based on ref.~\cite{geytenbeek21}, we introduce a complete basis of operators up to dimension 5 for fermions …
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Atmospheric responses to flare generated sunquakes
… Å and H-α 6563 Å passbands from the Swedish 1-m Solar Telescope (SST) were used in combination with space-based observations from the Heliosesimic and Magnetic Imager (HMI) onboard the Solar Dynamics Observatory (SDO). Both instruments observed wavefronts emanating from the X9.3 solar flare of …
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