The amplitude of auroral backscatter. II - Topology of the backscatter range-azimuth distribution

Details The amplitude of auroral backscatter. II - Topology of the backscatter range-azimuth distribution The amplitude of auroral backscatter. II - Topology of the backscatter range-azimuth distribution

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jatp...51..929u&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 51, Nov.-Dec. 1989, p. 929-936. Research supported by AN S

Physics

9

Auroral Electrojets, Auroras, Backscattering, Very High Frequencies, Atmospheric Refraction, E Region, Ionospheric Currents, Ionospheric Electron Density, Refractivity

Scientific paper

The range-azimuth distribution of auroral backscatter echoes received at Essoyla at frequencies of 93 and 45 MHz is predicted for a model which includes the effects of electron density, magnetic aspect angle, and the azimuth of current flow and also takes into account ionospheric refraction. The distribution is in the form of an arc with maxima of backscatter in both eastern and western wings. As the electron density increases, the intensity of the backscatter increases more rapidly and the azimuths of maximum backscatter separate even further. For currents flowig along the L-shell, the backscatter is strongest in the eastward wing. This asymmetry is intensified if the current flow is rotated anti-clockwise but if the current flow is rotated sufficiently in a clockwise direction the backscatter is stronger in the westward wing. These predictions are supported by observations made at Essoyla.

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