Other
Scientific paper
Sep 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....9412037g&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Sept. 1, 1989, p. 12037-12042.
Other
5
Auroral Arcs, Electron Precipitation, Field Aligned Currents, Ionospheric Electron Density, Electric Field Strength, Electron Acceleration, Magnetosphere-Ionosphere Coupling
Scientific paper
Consideration is given to observations showing that the upward field-aligned currents associated with auroral arcs are larger at their edges than within the arcs, focusing on the observations made with the Porcupine F4 rocket (Bruning and Geortz, 1985). It is found that an increase in the altitude of the top of the parallel electric field region does not sufficiently explain the increase in the upward field-aligned current at the edge of the arc crossed by the Porcupine F4. Other explanations are discussed, including the adiabatic acceleration of magnetospheric electrons through a field-aligned electrostatic potential. It is suggested that an increase in the density and/or a decrease in the perpendicular temperature of the magnetospheric electron population at the edge of the arc may explain the observed increase in upward field-aligned current.
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