Prof. Toshitaka Tsuda was awarded Medal with Purple Ribbon by the Government of Japan on November 3, 2017 in recognition of the achievements in the research field of atmospheric physics. He has developed various atmospheric measurement devices (radar, RASS, liders, etc.) using radio waves and light, and conducted pioneering field observations in domestic and oversea areas including Indonesia. He has made remarkable achievements in the clarification of driving of the atmospheric general circulation due to atmospheric waves, and the clarification of the global distribution of atmospheric gravity waves and ionospheric disturbances based on the GPS radio occultation data.