University of Oulu

Goode, W., Kempf, S., & Schmidt, J. (2021). Detecting the surface composition of geological features on Europa and Ganymede using a surface dust analyzer. Planetary and Space Science 208: 105343. https://doi.org/10.1016/j.pss.2021.105343

Detecting the surface composition of geological features on Europa and Ganymede using a surface dust analyzer

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Author: Goode, William1; Kempf, Sascha1; Schmidt, Jürgen2,3
Organizations: 1LASP, University of Colorado, Boulder, CO, USA
2Institute of Geological Sciences, Freie Universität, Berlin, Germany
3Space Physics and Astronomy Research Unit, University of Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 3.3 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe2021101851420
Language: English
Published: Elsevier, 2021
Publish Date: 2021-10-18
Description:

Abstract

Europa and Ganymede are both likely to have subsurface oceans (Carr et al., 1998; Khurana et al., 1998; Kivelson et al., 2000). Young surface features may provide an opportunity to sample material from either a subsurface ocean or bodies of liquid water near the surface (McCord et al., 1999, 2001). Detailed compositional information is of large interest for understanding the evolution, oceanic chemistry, and habitability of these moons. To develop an altitude-dependent model for the detectability of ejecta particle composition originating from surface features of a given size, we simulate detections by a dust analyzer with the capability of measuring compositional makeup on board a spacecraft performing close flybys of Europa and Ganymede (Postberg et al., 2011). We determine the origin of simulated detections of ejecta by backtracking their trajectories to the surface using velocity distributions given in the ejecta cloud model by Krivov et al. (2003). Our model is useful for designing flybys with typical closest approach altitudes, such as the ones planned for NASA’s Europa Clipper mission, where we wish to accurately identify the composition of surface features using a dust analyzer.

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Series: Planetary and space science
ISSN: 0032-0633
ISSN-E: 1873-5088
ISSN-L: 0032-0633
Volume: 208
Article number: 105343
DOI: 10.1016/j.pss.2021.105343
OADOI: https://oadoi.org/10.1016/j.pss.2021.105343
Type of Publication: A1 Journal article – refereed
Field of Science: 115 Astronomy and space science
Subjects:
Funding: This work was supported by NASA through the Europa Clipper Project.
Copyright information: © 2021 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/bync-nd/4.0/).
  https://creativecommons.org/licenses/by-nc-nd/4.0/