Auroral electron dispersion below inverted-V energies: Resonant deceleration and acceleration by Alfvén waves

Details Auroral electron dispersion below inverted-V energies: Resonant deceleration and acceleration by Alfvén waves Auroral electron dispersion below inverted-V energies: Resonant deceleration and acceleration by Alfvén waves

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jgra..11010s13c&link_type=abstract

Journal of Geophysical Research, Volume 110, Issue A10, CiteID A10S13

Physics

Plasma Physics

5

Space Plasma Physics: Wave/Particle Interactions (2483, 6984), Ionosphere: Auroral Ionosphere (2704), Ionosphere: Particle Acceleration, Ionosphere: Ionosphere/Magnetosphere Interactions (2736), Magnetospheric Physics: Numerical Modeling

Scientific paper

Rocket observations of electron time dispersion which occurs at energies below the primary inverted-V electron precipitation exhibit a variety of characteristics in the dispersion timescale and flux intensity distribution. We present simulation results that illustrate how different dispersion signatures can be produced by resonant acceleration and deceleration of auroral electrons by inertial Alfvén waves. We investigate the individual effects of relevant parameters such as the altitude of the inverted-V potential, Alfvén wave amplitude, wave velocity, and source electron population. The energies to which Alfvén waves can accelerate electrons are primarily determined by the peak Alfvén speed below the DC potential drop and to a lesser extent by the amplitude of the wave parallel electric field. The observed electron signatures can be used to obtain information about the peak Alfvén speed, the wave parallel electric field, the DC electric field, and plasma environment through which the waves propagate.

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