Sökning: "solar corona"
Visar resultat 1 - 5 av 14 avhandlingar innehållade orden solar corona.
1. Combining Models of Coronal Mass Ejections and Solar Dynamos
Sammanfattning : 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. LÄS MER
2. Radar Probing of the Sun
Sammanfattning : This thesis is dedicated to the theory of solar radar experiments. The Sun exhibits a variety of interesting and complicated physical phenomena, examined mainly through analysis of its radiation. Active solar probing by radar provides an alternative possibility to study the Sun. LÄS MER
3. Space Weather Physics, Prediction and classification of solar wind structures and geomagnetic activity using artificial neural networks
Sammanfattning : 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. LÄS MER
4. The coronal heating problem
Sammanfattning : The heating of the solar corona has been investigated during four of decades and several mechanisms able to produce heating have been proposed. It has until now not been possible to produce quantitative estimates that would establish any of these heating mechanism as the most important in the solar corona. LÄS MER
5. Formation of solar bipolar regions : Magnetic flux concentrations from suction of the negative effective magnetic pressure instability
Sammanfattning : Sunspots stand out on the visible solar surface. They appear as dark structures evolving and changing over time. They host energetic and violent events, like coronal mass ejections and flares, and concentrate strong magnetic fields. LÄS MER