Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm23a1690d&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM23A-1690
Physics
2704 Auroral Phenomena (2407), 2721 Field-Aligned Currents And Current Systems (2409), 2730 Magnetosphere: Inner, 2772 Plasma Waves And Instabilities (2471)
Scientific paper
We present 5 events with observation of the evolution of large scale auroral undulations imaged by IMAGE FUV. Auroral undulations are large scale wave structures seen at the equatorial edge of the auroral oval during enhanced geomagnetic activity. They develop close to, or during the maximum of strength of the ring current. As the auroral undulations propagate westward along the duskside, their amplitude is growing. When they enter the plasmasphere further west, the auroral undulations are seen to reduce in amplitude, and vanish. DMSP F13 data shows velocity shears in the plasma close to the crest of the undulations, where the velocity shears are due to the establishment of SAPS channels. Observations of the precipitating energetic ion flux show an excellent latitudinal overlap with the location and extent of the auroral undulation. We suggest that the large scale auroral undulations are a consequence of the Kelvin-Helmholtz instability, and that energetic ions constitute the plasma population that is modulated.
Daae M.
Lewis William S.
Østgaard Nikolai
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