Jan 1, 2011 · Ejecta were collected in bins at various distances from the impact. The observed nearly-90° ejection angle and the fall-distance to the chamber floor were used to calculate the ejection velocity of material in the collection bins. The …

Mar 1, 2022 · The amount by which crater ejecta enhances asteroid deflection—that is, the momentum of the crater ejecta that escapes the gravitational attraction of the target body divided by the impactor momentum (β − 1)—has been found to vary significantly depending on the target asteroid’s properties, composition and structure (e.g., Jutzi and ...

Mar 1, 2019 · As an example, Fig. 3 shows the ejecta velocity histogram with cumulative size distribution for a Cu projectile impacting on a sandstone target. A luminescent transient plasma plume followed by a steepening ejecta cone and completed by the detachment of spall fragments characterizes the typical evolution of ejecta [12]. The high-speed camera ...

Sep 1, 2024 · Distal ejecta make up about 10 % of the total ejecta and consist primarily of material that is highly shock metamorphosed, melted or vaporized and can be found in ejecta blankets from impact events throughout Earth’s geologic history (e.g., Glass and Simonson, 2013). During this process, ejected (ballistic) melt rapidly cools to form non ...

Feb 5, 2025 · The snapshots correspond to (a) interaction of the shock wave with the groove, (b) ejecta formation, (d–f) growth of the ejecta and expansion of the head, and (g) evolved ejecta. To further understand this jet head, the MD snapshots are analyzed to identify the atoms that form the jet, and the evolution of the average pressure and temperature ...

The ejecta size distributions follow a log-normal function near the peak diameter, while obey a power law for large particles. CRediT authorship contribution statement Bao Wu: Writing – review & editing, Writing – original draft, Software, Methodology, Investigation, Data curation, Conceptualization.

The size of ejecta that penetrated the foil targets at a velocity lower than the assumed values would have been underestimated, as the ratio of the hole size to ejecta size increases with velocity. Table 2 shows the constant values we determined for Eq. (1) for each ejecta velocity, while Fig. 3 a illustrates the empirical relationship ...

Jan 1, 2018 · The various ejecta facies were then examined in more detail using ∼0.5–1 m per pixel LROC Narrow Angle Camera (NAC) images (Robinson et al., 2010) to better define the facies boundaries and focus in on specific details and areas of interest. The individual images used to observe the morphology of Orientale ejecta were selected based on ...

The continuous ejecta blanket occurs proximal to the crater as large volumes of ballistically transported ejecta touchdown the pre-existing terrain to deposit as a contiguous blanket (Fig. 5 a–c) (Hörz et al., 1983). This proximal ejecta is located within a few crater radii from the rim and is more blocky and relatively high-albedo.

Nov 1, 2024 · The ejecta distribution satisfies a rotationally symmetric distribution along the Y-axis. The XOZ plane represents the surface position of the target, which is the initial ejection position of the ejecta. The ejecta forms a hollow cone with an angle approaching 140°. From Table 9, The cone angle decreases with increasing impact velocity.