Auroral and equatorial two-stream irregularities - Difference in nonlinear state

Details Auroral and equatorial two-stream irregularities - Difference in nonlinear state Auroral and equatorial two-stream irregularities - Difference in nonlinear state

Nov 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82.5195s&link_type=abstract

Journal of Geophysical Research, vol. 82, Nov. 1, 1977, p. 5195-5200. Research supported by the Nagoya University.

Physics

Auroral Electrojets, Equatorial Electrojet, Ionospheric Drift, Radar Echoes, Electromagnetic Fields, Electron Density Profiles, Ion Acoustic Waves, Nonlinear Systems

Scientific paper

It is shown that the electrojet velocity is reduced to the ion acoustic velocity by the two-stream irregularities if the width of the unstable layer is larger than, say, several hundred meters. However, if it is of the order of 100 m or smaller, the electrojet velocity is not appreciably changed, but the electron density is modified, the instability thereby being stabilized. On the basis of these results it is postulated that electrojets responsible for diffuse radar auroras are occasionally highly irregular and consist of many narrow streams with widths of the order of 100 m. Then the observational fact that irregularities with velocities larger than the ion acoustic velocity exist can be explained.

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