Sökning: "polar arc"

Hittade 2 avhandlingar innehållade orden polar arc.

1. 1. Polar auroral arcs

   Författare :Anita Kullen; KTH; []
   Nyckelord :polar arc; transpolar arc; interplanetary magnetic field; solar wind-magnetosphere coupling;

   Sammanfattning : .... LÄS MER

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

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

   Sammanfattning : 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. LÄS MER