Diffuse radar aurora - Spectral observations of non-two-stream irregularities

Details Diffuse radar aurora - Spectral observations of non-two-stream irregularities Diffuse radar aurora - Spectral observations of non-two-stream irregularities

Jan 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jgr....80..131g&link_type=abstract

Journal of Geophysical Research, vol. 80, Jan. 1, 1975, p. 131-139. Defense Nuclear Agency

Physics

7

Auroral Echoes, Equatorial Electrojet, Ionospheric Disturbances, Radar Scattering, Radio Auroras, Spectrum Analysis, Backscattering, Doppler Radar, Electron Density Profiles, Magnetohydrodynamic Stability, Radar Data

Scientific paper

Since the two-stream instability was identified as the source of one type of electron density irregularity that is found in the equatorial electrojet, a number of people have suggested that this instability is also responsible for diffuse radar aurora. In this paper we review past spectral studies and present some recent spectral observations of 3-m irregularities (50-MHz radar) that were made from Anchorage and Aniak, Alaska. Our observations indicate the presence of two distinct spectral components, both of which have a number of non-two-stream characteristics. Namely, they have an azimuth-dependent mean Doppler shift that approaches zero when the radar is directed perpendicular to the electrojet current. The broader spectral component, which we observe, has a typical width of 400 Hz, whereas the narrow component has a width of less than 150 Hz. The narrow component often displays a double-peaked structure with a peak separation of 30-60 Hz.

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