Multiple Electron Energy-time Dispersions Observed in the High-latitude Part of the Dayside Cusp Region

Computer Science – Sound

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2451 Particle Acceleration, 2455 Particle Precipitation, 2483 Wave/Particle Interactions, 2724 Magnetopause, Cusp, And Boundary Layers, 2736 Magnetosphere/Ionosphere Interactions

Scientific paper

Multiple electron energy-time dispersions (MEEDs) were observed at altitude of several hundred km in the high-latitude part of the dayside cusp region by a sounding rocket, which was launched on December 2000 from Ny-Å lesund. The MEEDs were characterized by field-aligned precipitation with falling energies from 200 eV down to 20 eV at a repetition rate of ˜ 2 Hz. Their time-of-flight analysis resulted in the source altitude of several thousand km. With test particle simulations, these characteristics of the MEEDs can be quantitatively interpreted in terms of the resonance acceleration of electrons with field-aligned electric fields generated by large amplitude inertial Alfvén waves. The Alfvén waves might originate at the dayside magnetopause, associated with magnetic reconnection.

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