The EISCAT (European incoherent scatter) project was established for the purpose of advancing our understanding of processes in the upper atmosphere at high latitudes. EISCAT was formed and is operated by research councils in France, West Germany, the United Kingdom, Finland, Sweden, and Norway. The facility itself consists of two incoherent scatter radar systems: a tristatic UHF radar at 933.5 MHz and a monostatic VHF radar at 224 MHz. Both transmitters are at Ramfjordmoen, near Tromsö, Norway. Additional receiver stations of the tristatic system are located at Kiruna, Sweden, and Sodankyla, Finland (see figure).