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| Titel |
Detection of Impact Ejecta on the Lunar Surface |
| VerfasserIn |
Yanwei Li, Ralf Srama |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250111234
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| Publikation (Nr.) |
 EGU/EGU2015-11325.pdf |
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| Zusammenfassung |
| One of the highest-priority issues for a future human or robotic lunar exploration is the lunar
dust. This problem should be studied in depth in order to develop an environment model for a
future lunar exploration. The impact ejecta of interplanetary meteoroids is one of the
source mechanics of the lunar dust environment. A dust detector placed on the lunar
surface is exposed to strong variations in the impact ejecta environment. The purpose
of this article is a study of the speed and trajectory information of ejecta created
by micrometeoroid impacts. Autodyn14.0/2D software was used to simulate the
impacting by micrometeoroids bombarding the lunar surface. The projectiles were
selected as 10 μm spheres in diameter with the speed of 17 km/
s-1. We used impact
angles of 30°, 45°, 60° and 90°. A part of impact ejecta grains created in the early
stage of impact process can be captured by a sensor placed on the lunar surface
(e.g. Lunar Ejecta and Meteorites (LEAM) experiment) or mounted on a lunar
lander (e.g. Lunar Dust eXplorer (LDX)). Most of the detectable ejecta grains have
very-low-speeds (< 100 m/
s-1) together with a few of high-speed ejecta grains (> 1
km/
s-1). Comparing with the most recently analysis of LEAM data, the impact
ejecta grains are considered as one of the most possible sources for the recorded
events. Furthermore, a sensor mounted on a lander instead of directly placed on the
lunar surface has more chances to measure high-speed ejecta. A new developed
instrument, such as LDX, will be a powerful tool to study the lunar dust environment. |
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