High-resolution bistatic CW interferometry for auroral ionospheric studies - Preliminary results

Details High-resolution bistatic CW interferometry for auroral ionospheric studies - Preliminary results High-resolution bistatic CW interferometry for auroral ionospheric studies - Preliminary results

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.5777h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, June 1, 1988, p. 5777-5786.

Physics

5

Auroral Spectroscopy, Coherent Radar, Continuous Radiation, Continuous Wave Radar, Earth Ionosphere, High Resolution, Doppler Radar, Interferometers, Plasma Turbulence

Scientific paper

The monostatic coherent radar interferometer technique which has been applied in the past few years to studies of short-wavelength plasma turbulence in the earth's ionosphere can provide, in addition to the Doppler spectrum, estimates of mean size, mean angular position, and velocity transverse to the viewing direction. Here, the conversion of an inexpensive bistatic 50-MHz CW Doppler system to an interferometer designed to investigate short-term dynamics of highly localized scattering regions in the auroral ionosphere is described, with mean transverse sizes in the range from about 0.5 to 5.0 km. Preliminary analysis shows, at times, high-coherence echoes, of type I or type III, to originate from localized, strongly unstable regions which are related to dynamic source regions of transient nature with mean azimuthal sizes possibly less than 1 km. The present observations suggest that the CW Doppler system, which provides high-quality spectra and excellent temporal resolution, has its measurement capability enhanced significantly when operated as an interferometer, becoming a powerful tool for studying short-term temporal and spatial variations of electrostatic turbulence in the auroral plasma.

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