Search for dissertations about: "Astronomy and astrophysics"
Showing result 1 - 5 of 462 swedish dissertations containing the words Astronomy and astrophysics.
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1. From irrotational flows to turbulent dynamos
Abstract : Many of the celestial bodies we know are found to be magnetized:the Earth, many of the planets so far discovered, the Sun and other stars,the interstellar space, the Milky Way and other galaxies.The reason for that is still to be fully understood, and this work is meant to be a step in that direction. READ MORE
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2. Thermophysical Modelling and Mechanical Stability of Cometary Nuclei
Abstract : Comets are the most primordial and least evolved bodies in the Solar System. As such, they are unique sources of information regarding the early history of the Solar System. However, little is known about cometary nuclei since they are very difficult to observe due to the obscuring coma. READ MORE
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3. Quasar host galaxies at intermediate and high redshifts
Abstract : Quasars form one of the most energetic phenomena in the universe, and can be traced out to very large redshifts. By studying the galaxies which host the active nuclei, important insights can be gained into the processes that trigger and maintain the quasar powerhouse. READ MORE
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4. Laboratory and stellar spectroscopy of the complex ions Fe+, Mo+, Th+ and U+
Abstract : The new generation of high resolution astronomical instruments such as the Hubble Space Telescope (HST) or the Very Large Telescope (VLT) has renewed the demand for accurate atomic parameters like wavelengths, oscillator strengths and line profiles accompanied by reliable uncertainty estimates. Fourier transform spectroscopy has proven to be a powerful tool when measuring these parameters. READ MORE
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5. Radio waves in the ionosphere : Propagation, generation and detection
Abstract : We discuss various topics concerning the propagation, generation, and detec-tionof high-frequency (HF) radio waves in the Earth's ionosphere. With re-gardsto propagation, we derive a full wave Hamiltonian and a polarization evo-lutionequation for electromagnetic waves in a cold, stratified magnetoplasma. READ MORE