In this paper, we show a first set of incoherent scatter data measured at EISCAT, showing profiles of very high ion temperature (greater than 8000K), observed along geomagnetic field lines. We analyze the incoherent-scatter spectra, their form and the influence of the ionsopheric electric field. We estimate the Joule heating energy input by two methods: from the electic field and from direct measurements of ion temperature. These estimations show that our measurements can be explained by the frictional heating between fast moving species. ¿ American Geophysical Union 1987