Radar observations of two-dimensional turbulence in the equatorial electrojet. III - Nighttime observations of type 1 waves

Details Radar observations of two-dimensional turbulence in the equatorial electrojet. III - Nighttime observations of type 1 waves Radar observations of two-dimensional turbulence in the equatorial electrojet. III - Nighttime observations of type 1 waves

Dec 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.5625f&link_type=abstract

Journal of Geophysical Research, vol. 83, Dec. 1, 1978, p. 5625-5632.

Computer Science

Sound

4

Atmospheric Turbulence, Doppler Radar, Equatorial Electrojet, Night Sky, Radar Echoes, Radar Measurement, Atmospheric Models, E Region, Echo Sounding, Electric Fields, Power Spectra

Scientific paper

A vertically pointed 50-MHz radar at Jicamarca is used for a detailed study of nighttime type I (two-stream) echoes from the equatorial electrojet. The observations show that at times the electrojet is more turbulent at night than during the day. More specifically, when the driving electrojet field is strong during the night, the echoes received by the radar exhibit a more pronounced type I component than is ever the case during the day. The type I echoes can dominate the spectrum, and can be observed over a much wider range of altitudes than in daytime. Although the radar is pointed normal to the direction of mean current flow, the spectra of these strong nighttime echoes appear quite similar to those obtained by a radar pointed nearly parallel to the current flow during the day or night. A model is proposed which appears to be able to account qualitatively, and perhaps even semiquantitatively, for the important features of the observations.

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