Dependence of radar auroral scattering cross section on the ambient electron density and the destabilizing electric field

Details Dependence of radar auroral scattering cross section on the ambient electron density and the destabilizing electric field Dependence of radar auroral scattering cross section on the ambient electron density and the destabilizing electric field

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990angeo...8..195h&link_type=abstract

Annales Geophysicae (ISSN 0992-7689), vol. 8, March 1990, p. 195-211.

Physics

30

Auroral Echoes, Ionospheric Electron Density, Radar Scattering, Radio Auroras, Scattering Cross Sections, E Region, Incoherent Scattering, Ionospheric Disturbances, Plasma Turbulence, Radar Measurement

Scientific paper

The effect of the destabilizing E x B electron drift and the E-region ambient electron density on the relative scattering cross section of one-meter auroral irregularities is studied. The results reported are based on a data set comprised of simultaneous coherent-radar echo intensities and incoherent-radar direct measurements. It is found out that both, E field and mean electron density are the definite factors in determining the strength of radar auroral echoes at magnetic aspect angles near perpendicularity. A functional relationship predicting, solely from incoherent scatter data, the coherent echo intensity during periods of stable diffuse radar auroral forms is presented. It is concluded that the electron drift velocity threshold is required for the appearance of echoes. The main destabilization mechanism of plasma is brought into the discussion, along with the importance of E-field magnitude.

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