A general association between discrete auroras and ion precipitation from the tail

Details A general association between discrete auroras and ion precipitation from the tail A general association between discrete auroras and ion precipitation from the tail

Nov 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....9312932l&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, Nov. 1, 1988, p. 12932-12940. Research supported by the Aerospace Cor

Physics

16

Auroral Arcs, Auroral Ionization, Earth Magnetosphere, Geomagnetic Tail, Ion Temperature, Particle Precipitation, Electron Energy, Energetic Particles, Energy Transfer, Magnetic Fields, Polar Orbits

Scientific paper

Observations from the spinning polar-orbiting S3-3 satellite were used to compare the locations of discrete auroral arcs (defined to be regions containing particle distributions consistent with field-aligned potential drops of not less than 0.5 kV) with regions of isotropic ion precipitation. It was found that the regions of discrete aurora are almost exclusively confined to the region of isotropic ion precipitation at all local times studied (polar cap arcs and local times near noon were not considered). It was also found that, throughout the local time interval studied, the discrete aurora was generally associated with spatial structure and boundaries in the precipitating ions, indicating that arc generation may be associated with structure in the particle population within the tail current sheet.

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