| Autor: |
Lee A. Fielding, Frank Postberg, S. P. Armes, Yanwei Li, K. Fiege, Ralf Srama, E. Grün, S. Bugiel, Mario Trieloff, A. J. Shu, Jon K. Hillier, Yiyong Wu, Mark C. Price |
| Rok vydání: |
2014 |
| Předmět: |
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| Zdroj: |
Meteoritics & Planetary Science. 49:1375-1387 |
| ISSN: |
1086-9379 |
| Popis: |
–To understand the process of cosmic dust particle impacts and translate cratermorphology on smoothed metallic surfaces to dust properties, correct calibration of theexperimental impact data is needed. This article presents the results of studies of cratermorphology generated by impacts using micron-sized polypyrrole (PPy)-coated olivineparticles. The particles were accelerated by an electrostatic dust accelerator to high speedsbefore they impacted onto polished aluminum targets. The projectile diameter and velocityranges were 0.3–1.2 lm and 3–7kms 1 . After impact, stereopair images of the craters weretaken using scanning electron microscope and 3-D reconstructions made to providediameter and depth measurements. In this study, not just the dimensions of crater diametersand depths, but also the shape and dimensions of crater lips were analyzed. The craterscreated by the coated olivine projectiles are shown to have complicated shapes believed tobe due to the nonspherical shape of the projectiles.INTRODUCTIONMicron-sized cosmic dust particles have attractedmuch attention as they are a valuable source of data onsmall bodies in the solar system. The properties ofcosmic dust play an important role in the understandingof some astronomical observations. The simplestexperiment for studying the cosmic dust is the exposureof a smooth and ductile metal to space for retrieval at alater date. A dust grain impacting onto the exposedmetal surface at more than 1 km s |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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