Observations of mesoscale auroral plasma cavity crossings with the Freja satellite

• We have used data from the Freja satellite, with an apogee of 1700 km over the auroral oval, to make a statistical analysis of mesoscale auroral plasma density cavities. Such cavities are defined to be regions in the auroral zone with size scales between

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LOWER-HYBRID WAVES; KILOMETRIC RADIATION; ELECTRON-DENSITY; SOURCE REGION; ACCELERATION; DEPLETIONS; ALTITUDE; ZONE

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