Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8136767 | Icarus | 2015 | 7 Pages |
Abstract
We performed impact experiments with granular targets to reveal the formation process of crater “rays”, the non-uniform ejecta distributions around some fresh craters on the Moon and planets. We found mesh patterns, loosely woven with spaces like a net, as ejecta. A characteristic length of spaces between meshes was evaluated, and an angle, defined as the ratio of the characteristic length to the distance from the ejection point, was obtained as â¼a few degrees. These features are similar to the results of the analyses of the ray patterns around two lunar craters, Glushko and Kepler. Numerical simulations of granular material showed that clear mesh pattern appeared at lower coefficients of restitution between particles but was less clear at larger one, suggesting that the inelastic collisions between particles cause the clear mesh-pattern formation of impact ejecta.
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Space and Planetary Science
Authors
T. Kadono, A.I. Suzuki, K. Wada, N.K. Mitani, S. Yamamoto, M. Arakawa, S. Sugita, J. Haruyama, A.M. Nakamura,