Doppler spectrum observations of long discrete echoes

Details Doppler spectrum observations of long discrete echoes Doppler spectrum observations of long discrete echoes

Feb 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987p%26ss...35..153h&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 35, Feb. 1987, p. 153-160.

Computer Science

1

Auroral Spectroscopy, Doppler Radar, Radar Echoes, Auroral Electrojets, Scandinavia, Spectrum Analysis

Scientific paper

Experimental evidence on long discrete echoes based on Doppler spectrum measurements is presented. It is found that the spectral properties of echoes differ significantly as compared to the commonly observed backscatter associated with typical auroral electrojet activity. Main observations are summarized as follows: (1) the spectra are confined at subion acoustic velocities and are very narrow, in sharp contrast with the broad spectra of typical auroral echoes; (2) the signal strength and spectrum width are isotropic in the observing plane; and (3) the spectrum width tends to increase linearly with drift velocity magnitude. These results suggest the presence of only one type of irregularity which is isotropic in the propagation plane perpendicular to the magnetic field.

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