He has also contributed to make the STEL, which was newly established in 1990, to an international institution, by inviting many top-class scientists to STEL and by organizing several important international conferences, such as the International Conference on Substorms-4 (ICS-4) at Lake Hamana on March 1998, the first STEP-Results, Applications, and Modeling Phase (S-RAMP) conference at Sapporo on October 2000, and the 23rd General Assembly of International Union of Geodesy and Geophysics (IUGG) in Sapporo on June-July 2003. His activities during the time of STEL also expanded to the international organizations. He was one of three major founders of Asia Oceania Geosciences Society (AOGS). He was a Vice President of the International Association of Geomagnetism and Aeronomy (IAGA) for 2003-2007 and member of several international committees of Committee on Space Research (COSPAR) and Scientific Committee on Solar-Terrestrial Physics (SCOSTEP). He acted as the editor of the Journal of Geophysical Research – Space Physics and Geophysical Research Letters for total eleven years. He was also enthusiastic for outreach of auroral sciences by publishing many public books and by editing a comic-book series of solar-terrestrial physics. The comic-book series are being further translated to more than ten languages in the world in collaboration with SCOSTEP. This translation activity is still going on, contributing widely to the public outreach of solar-terrestrial physics.