Physics
Scientific paper
May 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jgr....85.2092n&link_type=abstract
Journal of Geophysical Research, vol. 85, May 1, 1980, p. 2092-2098.
Physics
5
Auroral Absorption, Dynamic Characteristics, Ionospheric Storms, Riometers, Spatial Distribution, Spike Potentials, Diurnal Variations, Electric Fields, Geomagnetism, Ionospheric Electron Density, Scale (Ratio)
Scientific paper
The dynamics and spatial scale of auroral absorption events, named 'spikes', were investigated with a new multi-narrow-beam riometer experiment. Measurements of the components of the ionospheric electric field perpendicular to the geomagnetic field at the time of a spike were made with the auroral system Stare; an absorption spike is caused by a ribbon-shaped enhancement in the ionospheric electron density causing a maximum absorption at an altitude near 90 km. The velocity of a ribbon is generally poleward directed and of magnitude between 300 and 3000 m/s; the electric field within a ribbon is so weak that its poleward motion cannot be explained as E X B drift in the ionosphere. Finally, it was found that the maximum absorption and events in the electric field described typically occur during dusk to midnight in magnetic local time.
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