Search for dissertations about: "geomagnetic field"

Showing result 21 - 25 of 37 swedish dissertations containing the words geomagnetic field.

  2. 21. Satellite observations of auroral acceleration processes

    Author : Lars Eliasson; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Aurora; particle acceleration; space plasma; magnetosphere; ionosphere; polar cap; satellite observations;

    Abstract : Measurements with satellite and sounding rocket borne instruments contain important information on remote and local processes in regions containing matter in the plasma state. The characteristic features of the particle distributions can be used to explain the morphology and dynamics of the different plasma populations. READ MORE

  4. 22. The character of magnetic records of deformed soft sediments with emphasis on liquefaction structures

    Author : Guangyu Sun; Nils Axel Mörner; Don Tarling; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; magnetism; sediments; deformation; Earth sciences; Geovetenskap;

    Abstract : In this thesis the characteristics of magnetic records in deformed soft sediments during postglacial time in Sweden are studied. Magnetic records refer in this study to magnetic remanence (NRM and ChRM) and susceptibility, including its anisotropy (AMS). READ MORE

  5. 23. Energization and Acceleration of Dayside Polar Outflowing Oxygen

    Author : Sachiko Arvelius; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Solar wind-magnetosphere interactions; Magnetosphere-ionosphere coupling; O energization acceleration; O outflow; Space physics; Rymdfysik;

    Abstract : This thesis deals with energetic oxygen ions (i.e. single-charged atomic oxygen ions, O+) at altitudes higher than 5 Earth radii (RE) and at latitudes above 75 (toward 90) degrees invariant latitude (deg ILAT) in the dayside polar magnetosphere observed by Cluster. READ MORE

  6. 24. Multi-point Measurements of Ultra Low Frequency Waves in the Terrestrial Magnetosphere

    Author : Tommy Eriksson; Lars Blomberg; Ian Mann; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Space physics; Rymdfysik;

    Abstract : Waves in the mHz frequency range are prominent features of the terrestrial magnetosphere. In this frequency range the waves have wavelengths comparable to the lengths of the geomagnetic field lines. The waves are then standing waves along closed field lines with endpoints in the southern and northern ionosphere. READ MORE

  7. 25. Resonant Waves in the Terrestrial Magnetosphere

    Author : Tommy Eriksson; Lars Blomberg; Stephan Buchert; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Space physics; Rymdfysik;

    Abstract : Waves in the mHz frequency range are a prominent feature in the terrestrial magnetosphere. In this frequency range the waves have wavelengths comparable to the lengths of the geomagnetic field lines. The waves are then standing waves along closed field lines with endpoints in the southern and northern ionosphere. READ MORE