Computer Science – Sound
Scientific paper
Sep 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.7586k&link_type=abstract
Journal of Geophysical Research, vol. 86, Sept. 1, 1981, p. 7586-7594.
Computer Science
Sound
11
Auroral Zones, Electric Current, Electron Acceleration, Electron Beams, Energy Sources, Rocket Sounding, Atmospheric Electricity, Birkeland Currents, Equipotentials, Geomagnetic Tail, Ionospheric Sounding, Magnetic Field Configurations, Plasma Drift
Scientific paper
The energy sources, electric equipotentials and electric currents associated with auroral electron acceleration observed during rocket flight 18:152 are discussed. Steep flow gradients at the interface between the convection boundary layer and the plasma sheet are considered as the probable source of energy for dayside and dawn and dusk auroras, while it is suggested that the cross tail potential drop may provide an energy source for some midnight auroras. Birkeland currents that flow along distorted field lines are shown possibly to be important in the mechanism that produces U-shaped equipotentials in the ionosphere, as well as unexpected jumps in ionospheric or magnetotail currents and unusual electric fields and plasma drift in the magnetotail. The production of equipotential structures under oppositely directed higher-altitude electric fields is discussed, and it is pointed out that cold ionospheric plasma can enter the structure in a cusp-shaped region where fields are weak. The rocket data reveals that the sudden change in conductivity at the edge of the bright arc and the constancy of the electric field produce sudden changes in the Hall and Pedersen currents. It is concluded that current continuity is satisfied primarily by east-west changes in the electric field or conductivity.
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