Physics
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.7487f&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Sept. 1, 1984, p. 7487-7494.
Physics
107
Auroral Electrojets, E Region, Ionospheric Electron Density, Magnetohydrodynamic Stability, Plasma Waves, Electrostatic Waves, Field Aligned Currents, Ionospheric Drift, Ionospheric Ion Density, Unified Field Theory
Scientific paper
A general theory is developed for both electrojet waves and ion cyclotron and current convective waves observed above 120 km altitude. Previously defined electrojet instability theories are extended to encompass the effects of the magnetic field on ions and the presence of field-aligned currents. The ion-cyclotron (E) waves are assumed produced by the two-stream instability in regions dominated by ion magnetization effects. Field-aligned and cross-field currents drive the E waves, which have displayed threshold drift velocities (TDV) sensitive to conditions at altitudes with effective electron/ion and anomalous electron collision frequencies. The electron density gradients in the region affect the magnitude of the TDV for waves on scales of tens of meters. Recombinational damping increases the TDV for marginal damping of two-stream E waves and establishes a TDV for excitation of large-scale gradient drift waves which propagate nearly perpendicularly to the magnetic field and may have only 10-20 m wavelengths.
Farley Donald T.
Fejer Bela G.
Providakes James
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