Observations of mesoscale auroral plasma cavity crossings with the Freja satellite

Details Observations of mesoscale auroral plasma cavity crossings with the Freja satellite Observations of mesoscale auroral plasma cavity crossings with the Freja satellite

May 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jgr...103.9391m&link_type=abstract

Journal of Geophysical Research, Volume 103, Issue A5, p. 9391-9404

Physics

19

Ionosphere: Auroral Ionosphere, Ionosphere: Ionosphere/Magnetosphere Interactions, Ionosphere: Particle Acceleration, Ionosphere: Plasma Temperature And Density

Scientific paper

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 discrete arcs and inverted-V events in which the plasma density abruptly drops to less than 50% of the ambient plasma density. We present occurrence distributions by magnetic activity, local time, and magnetic latitude. It is found that cavity occurrence does not depend on magnetic activity. In contrast to earlier studies, we find cavities at all local times; however, a dawn-dusk asymmetry is found in the distribution. There is likewise a weak dawn-dusk asymmetry in the latitudinal distribution. Since our data cover a full year, seasonal dependence of cavity occurrence can also be investigated. We find a small seasonal trend, with cavities found more commonly during the dark season, but the trend is not quite statistically significant. We also study several plasma depletion processes that could be responsible for cavities at this altitude. The results suggest that more than one process is compatible with the distributions we find.

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