The JOULE Experiment: Observations of Small-Scale Structure in the Auroral Oval During a Substorm Event

Physics

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2411 Electric Fields (2712), 2704 Auroral Phenomena (2407)

Scientific paper

The JOULE experiment was carried out at the Poker Flat Research Range in Alaska on March 27, 2003, during a substorm event in the postmidnight sector. The objective of the experiment was to measure the electric fields and the Joule heating over a range of scale sizes from approximately 1000 km to a few tens of meters with the specific goal of obtaining estimates of the contributions of the small-scale fluctuations in the forcing to the overall Joule heating rates. The instrumentation included the SuperDARN radars covering the Alaska sector which represented the largest scales, an imaging coherent scatter radar covering the intermediate scales, and two instrumented rockets covering the smallest scales. In addition, chemical tracer releases provided information about the E-region wind profiles and the horizontal gradients in the winds across the auroral oval. An overview of the experiment, the substorm event, and the measurements will be presented.

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