Long wavelength irregularities in the equatorial electrojet

Details Long wavelength irregularities in the equatorial electrojet Long wavelength irregularities in the equatorial electrojet

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982georl...9..684k&link_type=abstract

Geophysical Research Letters, vol. 9, June 1982, p. 684-687.

Other

77

Equatorial Electrojet, Magnetohydrodynamic Stability, Plasma Waves, Radar Measurement, Traveling Waves, Electric Fields, Ion Acoustic Waves, Power Spectra, Wave Propagation, Wavelengths

Scientific paper

The radar interferometer technique is used at Jicamarca to study in detail irregularities with wavelengths of a few kilometers generated in the unstable equatorial electrojet plasma during strong type 1 conditions. In-situ rocket observations of the same instability process are discussed in a companion paper. These large scale primary waves travel essentially horizontally and have large amplitudes. The vertical electron drift velocities driven by the horizontal wave electric fields reach or exceed the ion-acoustic velocity even though the horizontal phase velocity of the wave is considerably smaller. A straightforward extension to the long wavelength regime of the usual linear theory of the electrojet instability explains this and several other observed features of these dominant primary waves.

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