FUKUOKA, Japan--(BUSINESS WIRE)--A balloon-assisted UAV (Unmanned Aerial Vehicle) named “Phoenix-S1”, collaboratively developed by Kyushu University and Fukuoka University, Japan, has successfully brought back stratospheric aerosol samples from the altitude of 22km and observed aerosol density at the altitude of 23km in Antarctica on 24th January 2015. The observation was performed as one of the summer activities of 56th Japanese Antarctic Research Expedition (JARE-56, the leader: Professor Yos