Blar i forfatter "Sortland, Daniel Selnes"
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Reduced models for geophysical fluid dynamics
Sortland, Daniel Selnes (Master thesis; Mastergradsoppgave, 2013-07-16)This thesis present a self-consistent derivation of reduced fluid models for geophysical dynamics confined to the midlatitude region. The reduced model will be derived by use of a regular perturbation method, that gives the same result as the classical models, such as the barotropic and baroclinic quasi-gestrophic potential vorticity model. It will be shown that such a rigorous treatment self-consistently ... -
A solvable blob-model for magnetized plasmas
Pecseli, Hans; Sortland, Daniel Selnes; Garcia, Odd Erik (Peer reviewed; Journal article; Tidsskriftsartikkel, 2016-09-06)A simple analytically solvable model for blobs in magnetized plasmas is proposed. The model gives results for a scaling of the blob velocity with the amplitude of the density perturbation. Limiting cases are considered: one where the plasma motion is strictly perpendicular to an externally imposed toroidal magnetic field, and one where the electrons can move along magnetic field lines to compensate ...