Dear Colleagues, The registration for the International EISCAT Radar School (14-19 August 2023 at Kilisjärvi, Finland) is now open at https://www.sgo.fi/Events/RS2023/, deadline 29th May at midnight Finnish time (UTC+3). This year, the EISCAT Scientific Association will take the new phased-array EISCAT_3D radar into use: the transmit-receive site in Skibotn, Norway, and the remote receiver sites at Kaiseniemi (Sweden) and Karesuvanto (Finland) are being deployed since last autumn. Sodankylä Geophysical Observatory (SGO) in close collaboration with EISCAT, will run a training course for new users of the EISCAT radars, from 14th to 19th August 2023 (Monday to Saturday): The International EISCAT Radar School will be held at Kilpisjärvi, Finland, close to the Skibotn site in Norway. The course will cover all essential aspects of the EISCAT systems, including their science programme. An overview of the hardware and software will be provided and future plans will be discussed, with a strong emphasis on EISCAT_3D. Tips on analysing and working with the data will be given and the participants will run an own radar experiment in a hands-on exercise. There'll be an excursion to the Skibotn EISCAT_3D radar site, as well as to the Finnish Kilpisjärvi Atmospheric Imaging Receiver Array (KAIRA) site, which is a multi-purpose radio telescope originally built for prototyping EISCAT_3D. The lecturers comprise members of the EISCAT staff and experienced scientists from the user community. As well as providing a good foundation for scientists new to incoherent scatter radar, this in-person radar school will facilitate creation of a network of peers among all participants, learners and instructors alike, as well as provide a chance for more established users to be updated on the latest and future developments. For more information please visit https://www.sgo.fi/Events/RS2023/. Please forward this message to anyone you might think is interested. Thank you! All the best from Sodankylä, Thomas Ulich