@inproceedings{oai:kyutech.repo.nii.ac.jp:00006038, author = {Toyoda, Kazuhiro and 豊田, 和弘 and Noda, Ryota and Cho, Mengu and 趙, 孟佑}, book = {Transactions of the Japan Society for Aeronautical and Space Sciences, Aerospace Technology Japan}, issue = {ists29}, month = {Jun}, note = {The number of electrostatic discharge (ESD) accidents on solar arrays has been increasing. Such accidents can cause serious problems for power generation, such as halting the normal operations of a satellite. To prevent ESD, ground checks should be performed under a normal potential gradient, i.e., when the satellite surface potential is negative with respect to space plasma. In this study, we obtained ESD parameters to establish a method for ground testing. Experiments were performed in a vacuum chamber with an electron gun. Discharge images (propagation length and velocity) were captured by an IR camera. The charge flowing into the discharge point was captured by a current probe. A non-contact surface potential probe measured 2D-potential distributions on test samples. As a result, we found that the threshold voltage of the electrical discharge was −10 kV and the amount of electric charge depended on the propagation area of the discharge plasma. The propagation velocity in a normal gradient potential was 105 m/s., 29th International Symposium on Space Technology and Science (ISTS), June 2 to June 9, 2013, Nagoya City, Aichi}, pages = {Pr_35--Pr_39}, publisher = {日本航空宇宙学会}, title = {Discharge Propagation in Normal Potential Gradient on Spacecraft}, volume = {12}, year = {2013}, yomi = {トヨダ, カズヒロ and チヨウ, メンウ} }