Abstract

We have analysed the EISCAT data from two long campaigns, in October 1992 and in January 1993, in order to derive the three components (N-S, E-W, vertical) of the neutral wind in the E region. The winds are derived using the simultaneously measured ion-neutral collision frequency. We calculate the tidal parameters of the measured winds and compare them with models. In addition the CP2 experiment allows us to determine the vertical wind in two independent ways. During the disturbed day of the October campaign we derived a very large vertical wind. Such large values are not reproduced in any model. In this article we discuss the validity of our results.

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