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X-ray fluorescence modelling for Solar system regoliths: Effects of viewing geometry, particle size, and surface roughness

Published online by Cambridge University Press:  01 August 2006

Jyri Näränen ,
Hannu Parviainen  and
Karri Muinonen
Jyri Näränen
Affiliation:
Observatory, Tähtitorninmäki (PO Box 14), FI-00014 University of Helsinki, Finland
Hannu Parviainen
Affiliation:
Observatory, Tähtitorninmäki (PO Box 14), FI-00014 University of Helsinki, Finland
Karri Muinonen
Affiliation:
Observatory, Tähtitorninmäki (PO Box 14), FI-00014 University of Helsinki, Finland
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Abstract

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Soft X-ray fluorescent emission from the surfaces of asteroids and other atmosphereless solar-system objects is studied using ray-tracing techniques. X-ray observations allow the assessment of the elemental composition and structure of the surface. The model regolith is assumed to consist of close-packed uniformly distributed spherical particles of equal size. The surface is also assumed to be rough according to a fractional-Brownian-motion model. The fluorescent X-ray emission from regolith surfaces is simulated in order to better understand the contribution of viewing-geometry -related phenomena on the signal obtained from, e.g., orbiting platforms. The first results are presented and the applicability of the methods to the interpretation of future asteroid and Mercury mission X-ray data (e.g., BepiColombo) is discussed.

Keywords

spectroscopyMoon: asteroidssurfaceX-raysscattering
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S236: Near Earth Objects, our Celestial Neighbors: Opportunity and Risk , August 2006 , pp. 243 - 250
Copyright
Copyright © International Astronomical Union 2007

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