A particle simulation of large-amplitude undulations on the evening diffuse auroral boundary

Details A particle simulation of large-amplitude undulations on the evening diffuse auroral boundary A particle simulation of large-amplitude undulations on the evening diffuse auroral boundary

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.1439y&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Feb. 1, 1991, p. 1439-1449.

Physics

12

Auroral Arcs, Cold Plasmas, Energetic Particles, Kelvin-Helmholtz Instability, Particle Motion, Proton Energy, Computerized Simulation, Electric Fields, Geomagnetism, Magnetic Storms

Scientific paper

The pattern of undulation on the equatorward boundary of the diffuse aurora, occasionally observed in the afternoon-evening sector, is studied by two-dimensional particle simulations for the motion of magnetospheric plasma perpendicular to the geometric field. The poleward electric field is assumed to be initially enhanced locally in latitude and independent of longitude, as suggested by observations. Such an electric field is assumed to be maintained by space charges carried by a cold plasma. The diffuse aurora is initially distributed over a longitudinally extended zone. The temporal evolution of the diffuse auroral pattern, as displayed in photographs from satellites, can be visualized by following the cluster of energetic protons. Sheared plasma flow arising from the electric field distribution drives the Kelvin-Helmholtz instability and causes undulations on the equatorward boundary of the diffuse aurora with wavelengths and amplitudes comparable to the typical observed values.

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