HR: 12:05h
AN: SM42A-08    [Abstracts]
TI: Wave Acceleration of Auroral Electrons in the Presence of Quasi-static Parallel Electric Fields
AU: * Lysak, R L
EM: bob@aurora.space.umn.edu
AF: School of Physics and Astronomy University of Minnesota, 116 Church Street SE, Minneapolis, MN 55455, United States
AU: Song, Y
EM: yan@aurora.space.umn.edu
AF: School of Physics and Astronomy University of Minnesota, 116 Church Street SE, Minneapolis, MN 55455, United States
AB: Recent observations from the FAST satellite as well as a number of sounding rocket missions have shown two distinct modes of auroral electron acceleration: the classic inverted-V signature consisting of a beam broad in pitch angle but narrowly confined in energy, and a lower energy, field-aligned acceleration that has been attributed to kinetic Alfven waves. Moreover, observations indicate that these two particle populations often co-exist, suggesting that Alfvenic acceleration can occur on field lines with a quasi-static potential drop. Reflected ionospheric electrons can interact with the downward propagating Alfven producing a Fermi-like acceleration mechanism. A non-local kinetic theory including trapped and reflected electrons has been developed to model these wave-particle interactions. Results from this model of the evolution of the electron particle distributions will be presented and compared with test particle simulations.
DE: 2704 Auroral phenomena (2407)
DE: 2712 Electric fields (2411)
DE: 2736 Magnetosphere/ionosphere interactions (2431)
DE: 7829 Kinetic waves and instabilities
DE: 7867 Wave/particle interactions (2483, 6984)
SC: SPA-Magnetospheric Physics [SM]
MN: 2007 Joint Assembly