Abstract
A method of interpreting incoherent scatter radar monopulse ACF measurements in the E-region in terms of ion temperature and ion-neutral collision frequency is presented and has been applied to data taken at Chatanika. The method produces reliable estimates of the ion temperature but the variation of ion drift velocity across the monopulse range gate restricts collision frequency measurements to periods with perpendicular electric fields less than 25mVm −1. The collision frequency measured here is approximately a factor of two higher than the model value adopted by Rino et al. (1977) in their determination of neutral winds from Chatanika radar data.
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