The effect of rapid changes in ionospheric flow on velocity vectors deduced from radar beam-swinging experiments |
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| Institution: | 1. School of Energy, Construction and Environment, Coventry University, CV1 5FB, United Kingdom;2. School of Planning, Architecture and Civil Engineering, Queen''s University Belfast, BT9 5AG, United Kingdom;1. University Clermont Auvergne, CNRS, Clermont-Ferrand, France;2. University of Groningen, Groningen, Netherlands;3. University of Sussex, Brighton, United Kingdom;4. Nottingham Trent University, Nottingham, United Kingdom |
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| Abstract: | The effects on the horizontal ionospheric velocity vectors deduced from radar beam-swinging experiments, which occur when changes in the flow take place on short time scales compared with the experiment cycle time, are analysed in detail. The further complications which arise in the interpretation of beam-swinging data, due to longitudinal gradients in the flow and to field-aligned flows, are also considered. It is concluded that these effects are unlikely to seriously compromise statistical determinations of the response time of the flow, e.g. to changes in the north-south component of the IMF, such as have been recently reported by Etemadi et al. (1988, Planet. Space Sci. 36, 471), using EISCAT ‘Polar’ data. |
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