A Comparison of the Motion of Auroral Ion Outflow Regions With the Motion of Auroral Arcs

Physics

Scientific paper

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2451 Particle Acceleration, 2704 Auroral Phenomena (2407), 2736 Magnetosphere/Ionosphere Interactions

Scientific paper

During February and March of 2001, the CLUSTER satellites recorded a number of perigee passes through the near-midnight auroral zone. The CIS CODIF experiments on CLUSTER measure ion composition over the energy range 20 eV/e to 40 keV/e. During the auroral passes the CIS experiment measured highly structured ion outflow. The multiple spacecraft observations allow us to track how the ion outflow regions move with time. We compare this motion with the motion of the auroral arcs observed at the same time with the FUV instrument on IMAGE. An initial study of one event showed that the ion outflow motion did track the arc motion fairly well, but was also consistent with the locally measured convection velocity. We now extend this study to include more cases under various auroral conditions in order to determine how well the motion of the ion outflow regions are correlated with the arc motion.

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