12:15 PM - 12:30 PM
[PPS21-12] In-situ observations of the ablation processes of artificial shooting stars
Keywords:Small bodies, Shooting stars, Aerodynamic ablation, Two-stage light gas gun, High-speed imaging, Time-resolved emission spectroscopy
We have made artificial shooting stars using a two-stage light gas gun at a new laboratory of Planetary exploration Research Center of Chiba Institute of Technology (PERC/Chitech). A flight tube for accelerated projectiles and a chamber were filled with N2 gas. Then, a plastic sphere was shot into the N2 gas. A high-speed imaging observation and a time-resolved spectroscopic observation of an artificial shooting star, observed from two directions perpendicular to the projectile trajectory, were conducted simultaneously. The distance between the projectile trajectory and the collecting optics of measuring instruments was ~50 cm. We successfully resolved the spatial distribution of an artificial shooting star with the time and spatial resolution of 0.5 us and 100 um, respectively. The spatial structure of the shooting star, the distribution of produced gases, and the blackbody temperature along the trajectory were obtained. We are planning to investigate the elemental steps of the energy partitioning with the comparison between the experimental results and the prediction by a computational fluid dynamics.