Abstract
A pulsed double-Doppler radar technique has been employed to study the 90.7 Mc/sec signals reflected from auroral ionization. A spectrum analyzer was used in conjunction with the radar to measure the power spectra of the auroral echoes. The Doppler data are compared with observations of the visible aurora and with simultaneous echoes on 56 and 106 Mc/sec non-coherent high-resolution radar equipment. An interpretation of the Doppler data is given, and several theoretical models of the reflection mechanism are examined in terms of their effect on the observed spectra.
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