Physics
Scientific paper
Apr 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.3733b&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 95, April 1, 1990, p. 3733-3743. Research supported by DFG.
Physics
19
Field Aligned Currents, Geoelectricity, Geomagnetic Micropulsations, Ionospheric Currents, Current Density, Eiscat Radar System (Europe), Hall Effect, Magnetometers
Scientific paper
On April 21, 1985, an intense Ps 6 pulsation event was observed with the EISCAT radar and the EISCAT magnetometer cross. These measurements serve as a reference for a new electrostatic model for the ionospheric conductances, electric fields, and currents of the auroral structures associated with the pulsations, whose auroral signatures are the Omega bands. All parameters are essentially derived from the input field-aligned current distribution. By varying this distribution and a few free parameters in the relation between the conductances and the upward current, the model is adjusted to the data. By a rearrangement of the upward current from a one-dimensional sheet configuration to tonguelike poleward extensions, the observed event is reproduced in a satisfactory way. Compared to previous works, the Hall current is modulated in a different, less symmetric way, and considerably lower field-aligned current densities are required.
Baumjohann Wolfgang
Buchert Stephan
Haerendel Gerhard
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