Physics
Scientific paper
Dec 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....9213537g&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Dec. 1, 1987, p. 13537-13545.
Physics
10
Auroral Zones, Charged Particles, Earth Magnetosphere, Steady State, Tropical Regions, Particle Energy, Particle Motion, Spatial Distribution, Time Dependence
Scientific paper
The auroral low-latitude boundaries were studied from the precipitating particle data acquired by the NOAA spacecraft, and the results were compared with the results of a statistical analysis. A simple quantitative numerical model was developed which explicitly demonstrates systematic changes which occur in particle boundary topologies due to time dependence. It is demonstrated that time-dependent transitions between various levels of activity can lead to characteristic boundary shapes that are quite dissimilar to steady state solutions and to some extent can provide a resolution between observed and computed boundary shapes for time scales pertinent to magnetospheric activity. The length of time after the onset of enhanced activity was found to be as important as the instantaneous level of activity in ordering the shape of auroral boundaries.
Evans Silvan D.
Gorney David J.
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