Observation of Vertically Ejected Plumes Generated by the Impact of Hollow Projectiles at Various Velocities

Abstract Recently, impact experiments in space have been conducted planetary exploration using hollow or internally structured projectiles. In laboratory projectiles to investigate the differences crater and ejecta from case of solid projectiles, a plume perpendicular target surface has observed, which not seen conventional cratering this study, we crater-formation resin understand mechanism through vertical plumes form We examined generation as function velocity, v imp . found that (i) no occurs at < 200 m s −1 , (ii) cases with without are mixed 350 (iii) 800 (iv) 2 3 km qualitatively discussed results recovered Depending on an empty hole there is projectile materials can be opened along central axis, resulting plume.