Search for dissertations about: "solar corona"

Showing result 1 - 5 of 13 swedish dissertations containing the words solar corona.

  1. 1. Combining Models of Coronal Mass Ejections and Solar Dynamos

    University dissertation from Stockholm : Department of Astronomy, Stockholm University

    Author : Jörn Warnecke; Axel Brandenburg; Juri Toomre; [2013]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Magnetohydrodynamics; convection; turbulence; solar dynamo; solar rotation; solar activity; coronal mass ejections; Astronomy; astronomi;

    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

  2. 2. Radar Probing of the Sun

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Mykola Khotyaintsev; Uppsala universitet.; [2006]
    Keywords : Space and plasma physics; solar radar; active experiments; space physics; solar corona; plasma; Rymd- och plasmafysik;

    Abstract : 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. READ MORE

  3. 3. Space Weather Physics, Prediction and classification of solar wind structures and geomagnetic activity using artificial neural networks

    University dissertation from Lund Observatory, Lund University

    Author : Peter Wintoft; [1997]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Astronomi; cosmic chemistry; space research; Astronomy; solar magnetic fields; space weather; solar wind; magnesphere; artificial neural networks; geomagnetic activity; rymdvetenskap; kosmisk kemi; Fysicumarkivet A:1997:Wintoft;

    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

  4. 4. The coronal heating problem

    University dissertation from Stockholm : Institutionen för astronomi

    Author : Boris V. Gudiksen; Göran Scharmer; James Klimchuk; [2004]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Solen; Corona; Magneto hydro dynamik; NATURAL SCIENCES Physics Astronomy and astrophysics; NATURVETENSKAP Fysik Astronomi och astrofysik;

    Abstract : 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. READ MORE

  5. 5. Spectroscopy of highly charged ions: New studies in the He, Be, N, O, Na and Mg isoelectronic sequences

    University dissertation from Department of Physics, Lund University

    Author : Ilmar Kink; [1999]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Atomic and molecular physics; Fysicumarkivet A:1999:Kink; solar corona; Atom- och molekylärfysik; SUMER; highly charged ions; isoelectronic sequences; spectroscopy; atomic lifetimes; Beam-foil; SOHO.;

    Abstract : Spectroscopic investigations of highly charged ions have been performed in the VUV, UV and visible spectral regions using mainly the beam-foil technique. New 2s22px3l levels have been established in N and O-like Si and S, together with many transitions between these levels. READ MORE