A new look at radar auroral motions

Details A new look at radar auroral motions A new look at radar auroral motions

Sep 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jgr....80.3642g&link_type=abstract

Journal of Geophysical Research, vol. 80, Sept. 1, 1975, p. 3642-3648.

Physics

2

Auroral Echoes, Digital Radar Systems, Radar Tracking, Radio Auroras, Data Processing, Radar Data, Radar Maps, Radar Scattering

Scientific paper

Temporary modifications added to the NOAA radar auroral backscatter facility at Anchorage, Alaska, are described. These included a multiple azimuth antenna system, an on-line computer for processing amplitude and mean Doppler profiles of the radar backscatter, and a 13-baud Barker coder to increase the effective transmitter power. The modified facility was used to obtain data relevant to the microscopic as well as macroscopic properties of the radar aurora. It is shown that appreciable structure was often found in the Doppler velocity profiles of radar auroral irregularities and that Doppler velocities of nearly 2000 m/sec were observed. Contour maps of the scatter intensity and Doppler velocity are constructed which indicate considerable temporal and spatial structure in the radar auroral irregularities and their flow velocities. It is found that when large-scale uniformity seems to exist in the irregularity flow, the Doppler velocity varies with azimuth in a way that is consistent with a cosine-dependent azimuthal variation.

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