Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm22c..03c&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SM22C-03
Physics
2451 Particle Acceleration, 2704 Auroral Phenomena (2407), 2716 Energetic Particles, Precipitating, 2731 Magnetosphere: Outer, 2752 Mhd Waves And Instabilities
Scientific paper
Aurora on the open/closed field line boundary on the poleward edge of the auroral oval are powered by dispersive Alfven waves. By the use of observations from the FAST and Cluster spacecraft when in magnetic conjunction we identify these waves at different points along the same fieldline. The dispersive nature of the waves at each altitude is tested against existing theories for wave dispersion where finite electron inertia and finite gyro-radii become important. The multipoint observations enable a direct comparison of the electron energy flux and wave Poynting observed at each spacecraft to determine the altitude where most of the observed electron energisation occurs and how much of the initial wave energy is dissipated through electron acceleration. Observations from Cluster also allow us to identify a possible source for these waves.
Bonnell Jerry
Carlson Carl
Chaston Christopher. C.
Ergun Robert
McFadden Johnjoe
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