Search for dissertations about: "Solar Activity"
Showing result 1 - 5 of 114 swedish dissertations containing the words Solar Activity.
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1. Geomagnetic activity : periodic variations and connection to solar and interplanetary magnetic fields
Abstract : .... READ MORE
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2. Combining Models of Coronal Mass Ejections and Solar Dynamos
Abstract : Observations show that Coronal Mass Ejections (CMEs) are associated with twisted magnetic flux configurations. Conventionally, CMEs are modeled by shearing and twisting the footpoints of a certain distribution of magnetic flux at the solar surface and letting it evolve at the surface. READ MORE
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3. Solar Wind and Geomagnetic Activity - Predictions Using Neural Networks
Abstract : This thesis shows how artificial neural networks (ANNs) can be applied to predict geomagnetic activity from solar-wind data. It introduces and summarizes five papers where development of ANN models are reported, and where predictions of geomagnetic activity are discussed. READ MORE
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4. Space Weather Physics, Prediction and classification of solar wind structures and geomagnetic activity using artificial neural networks
Abstract : This thesis concerns the application of artificial neural network techniques to space weather physics. The networks applied include multi-layer error-backpropagation, radial basis function, and self-organized maps. READ MORE
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5. Origin of solar surface activity and sunspots
Abstract : In the last few years, there has been significant progress in the development of a new model for explaining magnetic flux concentrations, by invoking the negative effective magnetic pressure instability (NEMPI) in a highly stratified turbulent plasma. According to this model, the suppression of the turbulent pressure by a large-scale magnetic field leads to a negative contribution of turbulence to the effective magnetic pressure (the sum of non-turbulent and turbulent contributions). READ MORE