Abstract

One of the puzzling, and hitherto unexplained, properties of VHF backscatter from the auroral electrojet is the occurrence of a thin, horizontal and remarkably uniform backscattering layer during the afternoon period. If the backscattering regions are in fact twostream plasma instabilities, it is shown that the properties of the afternoon backscatter can be explained by invoking an electric field perpendicular to the magnetic field.

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