Search for dissertations about: "Aurora acceleration region"

Found 4 swedish dissertations containing the words Aurora acceleration region.

  2. 1. 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. 2. Cluster in situ studies of the auroral acceleration region

    Author : Bin Li; Göran Marklund; Stein Haaland; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Cluster; Aurora acceleration region; Physics; Fysik;

    Abstract : This thesis addresses a central topic in auroral physics, namely particle accelerationproducing intense aurora as well as energetic plasma outflow. Cluster satellitemeasurements of electric and magnetic fields, electrons and ions, collected across auroralfield lines, are used to study various aspects of the quasi-static auroral accelerationregion (AAR), its relation to the auroral density cavity, and the relative role of quasistaticand Alfvénic acceleration for producing aurora. READ MORE

  5. 3. Multi-Spacecraft Observations of the Auroral Acceleration Region

    Author : Soheil Sadeghi; Göran T. Marklund; Andris Vaivads; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : The two major agents for producing aurora are generally believed to be the quasi-static parallel electric fields, accelerating electrons in the auroral acceleration region (AAR), and Alfvén waves. The Cluster spacecraft quartet has made multi-spacecraft measurements in the AAR possible for the first time. READ MORE

  6. 4. Enhanced Radar Backscatter from the Ionosphere

    Author : Nicola Schlatter; Nickolay Ivchenko; Noora Partamies; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : Incoherent scatter radars are powerful ground based instruments for ionospheric measurements. By analysis of the Doppler shifted backscatter spectrum, containing the signature of electrostatic plasma waves, plasma bulk properties are estimated. READ MORE