High-resolution radar observations of daytime kilometer-scale wave structure in the equatorial electrojet

Details High-resolution radar observations of daytime kilometer-scale wave structure in the equatorial electrojet High-resolution radar observations of daytime kilometer-scale wave structure in the equatorial electrojet

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....99..299f&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A1, p. 299-307

Physics

22

Equatorial Electrojet, Plasma Turbulence, Plasma Waves, Power Spectra, Spatial Resolution, Wave Propagation, Computerized Simulation, Daytime, Doppler Radar, Radar Echoes, Radar Measurement

Scientific paper

Using a new antenna configuration and new data processing hardware, we probed the electrojet with unprecedented spatial resolution in January 1991 at Jicamarca. The altitude resolution was 125 m, and the east-west antenna beamwidth was about 0.6 deg, or about 1 km at electrojet altitudes. The high spatial resolution allowed us to observe, at certain altitudes and times, pronounced wavelike structures with vertical wavelengths of the order of 1 km and periods of tens of seconds. These observations closely resemble the predictions of recent nonlocal, nonlinear numerical simulations of large-scale turbulence in the equatorial electrojet (Ronchi et al., 1991). The comparison demonstrated the validity of the theory and confirmed the idea that the Doppler power spectra of type 2 echoes at 50 MHz (due to 3-m plasma waves generated by the gradient-drift instability and a nonlinear cascade of energy from long-wavelength modes to short) are controlled primarily by the large-scale dynamics and not by the nonlinear local growth and decay rates of the 3-m waves themselves.

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