Dr. Keisuke Hosokawa completed a doctorate in solar-terrestrial physics at Department of Geophysics, Graduate School of Science, Kyoto University. He is now a professor in Department of Communication Engineering and Informatics, The University of Electro-Communications, Tokyo. His research interest covers various phenomena in the planetary upper atmosphere including aurorae, ionospheric waves and plasma bubbles. His team is currently operating a number of radio and optical instruments in the world, for example in high Arctic region. He has been serving as a Topical editor for Annales Geophysicae since 2012.