Physics
Scientific paper
Feb 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985angeo...3...57p&link_type=abstract
Annales Geophysicae (ISSN 0755-0685), vol. 3, Jan.-Feb. 1985, p. 57-62.
Physics
7
Auroral Zones, E Region, Ion Acoustic Waves, Ionospheric Drift, Plasma Waves, Boltzmann Transport Equation, Electric Fields, Electron Density (Concentration), Phase Velocity, Radar Scattering
Scientific paper
Results from a rocket experiment (Bahnsen et al., 1978) where simultaneous and accurate data are obtained on the electric field, as well as on extremely low-frequency electrostatic plasma-density waves in the dayside auoral ionospheric E-region are reexamined. The observations in the auroral ionosphere of plasma-wave phase velocities which are equal to the ion acoustic speed rather than to the differential electron-ion drift velocity as predicted by linear theories, are explained by the slight modification of the linear theory suggested by Sudan (1983). The modification depends on the average wave-fluctuation level, and continues until the growth rate is zero and the wave amplitude is stable. The observed wave-potential amplitudes and the relative density fluctuations are found to be in agreement with the modified linear equations.
Bahnsen Axel
Primdahl Fritz
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