Wave Acceleration of Auroral Electrons in the Presence of Quasi-static Parallel Electric Fields

Details Wave Acceleration of Auroral Electrons in the Presence of Quasi-static Parallel Electric Fields Wave Acceleration of Auroral Electrons in the Presence of Quasi-static Parallel Electric Fields

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agusmsm42a..08l&link_type=abstract

American Geophysical Union, Spring Meeting 2007, abstract #SM42A-08

Computer Science

Sound

2704 Auroral Phenomena (2407), 2712 Electric Fields (2411), 2736 Magnetosphere/Ionosphere Interactions (2431), 7829 Kinetic Waves And Instabilities, 7867 Wave/Particle Interactions (2483, 6984)

Scientific paper

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.

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