Abstract
A multichannel Barker coded EISCAT experiment with basic spatial and temporal resolutions of 600 m and 10 s, respectively, is described. The experiment was run on 13–17 February 1984 and data obtained in a diffuse aurora as well as in an auroral arc are used for determining the ion-neutral collision frequency in the lower E-region. Post-integration over 20 and 3 min, respectively, is carried out in the two cases and the plasma parameters are fitted with the assumption of equal ion and electron temperatures. The effect of varying the temperature ratio is discussed. The obtained collision frequencies are generally found to be in accordance with profiles based on the CIRA (1972) model atmosphere. In addition to collision frequencies, vertical ion velocities and electron temperature profiles are presented. It is found that the velocities are consistent with the observed electric fields.
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