Radar interferometry - A new technique for studying plasma turbulence in the ionosphere

Details Radar interferometry - A new technique for studying plasma turbulence in the ionosphere Radar interferometry - A new technique for studying plasma turbulence in the ionosphere

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.1467f&link_type=abstract

Journal of Geophysical Research, vol. 86, Mar. 1, 1981, p. 1467-1472.

Physics

94

Earth Ionosphere, Interferometry, Plasma Turbulence, Radar Measurement, Radar Scattering, Space Plasmas, Auroral Electrojets, Coherent Radar, Equatorial Atmosphere, F Region, Magnetohydrodynamic Stability, Power Spectra, Spatial Resolution

Scientific paper

A new radar interferometry technique has been developed and employed successfully at the Jicamarca Radio Observatory in Peru to investigate the strong nighttime plasma turbulence in the equatorial electrojet. Two backscattered signals were received separately on the east and west quarters by means of antennas pointed approximately vertically and perpendicular to the magnetic field. Each signal was sampled at a number of ranges and Fourier transformed. The normalized cross spectrum was computed for each range and the results were averaged. The phase of the cross spectrum at different Doppler frequencies was used to determine the individual positions of plasma wave packets propagating vertically with different velocities. Oppositely propagating waves are found to always come from distinctly separated regions. A vertical profile of drift velocity is obtained by using the irregularity patches as tracers and following their east-west motion. Initial observations show that echoes with positive and negative Doppler shifts come from different locations and that at night the vertical Doppler velocity may substantially exceed the mean horizontal velocity of the patch.

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