Characteristics of Nightside Auroral Arcs

Physics

Scientific paper

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2407 Auroral Ionosphere (2704), 2451 Particle Acceleration, 2704 Auroral Phenomena (2407), 2712 Electric Fields (2411)

Scientific paper

Auroral arcs have been studied by in-situ measurements over 30 years and these measurements have revealed a wide variety of plasmaphysical processes taking place in association with aurorae. This talk summarises some of the observations made in the vicinity of nightside auroral arcs in the ionosphere, at middle altitudes (thousands of km) and at high altitudes (a couple of ten thousand km) as observed by the EISCAT radar, Viking and Cluster satellites, respectively. Also, ground-based optical measurements have played an important role. Arc-associated current systems, electric fields at different altitudes and particle signatures are discussed for medium and small scale auroral arcs.

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