A particle simulation of 'giant' undulations on the evening diffuse auroral boundary

Details A particle simulation of 'giant' undulations on the evening diffuse auroral boundary A particle simulation of 'giant' undulations on the evening diffuse auroral boundary

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.5785y&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A4, p. 5785-5800.

Physics

18

Auroral Electrojets, Auroras, Digital Simulation, Earth Magnetosphere, Magnetic Storms, Space Plasmas, Energetic Particles, Field Aligned Currents, Kelvin-Helmholtz Instability, Spatial Distribution, Waveforms

Scientific paper

A numerical simulation of 'giant' undulations on the equatorward boundary of the evening diffuse aurora, occasionally observed during a substorm, is reported. The 2D partial code is used for studying the motion of magnetospheric plasma perpendicular to the geomagnetic field. Anomalous cross-field diffusion of the arc sheet (azimuthally aligned sheet of enhanced density) protons leads to polarization of the arc sheet. The outstanding indentations characteristic of observed giant undulations are successfully reproduced. The distributions of electric fields and space charges obtained from the simulation are found to be consistent with observations of electric fields, field-aligned currents, and fluxes of precipitating particles around the undulating diffuse auroral boundaries. It is concluded that giant undulations on the equatorward diffuse auroral boundary can be identified with spatial modulation of the energetic protons by the K-H waves arising from the polarized arc sheet.

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