Imperial College London
Alternate

ProfessorMarinaGaland

Faculty of Natural Sciences, Department of Physics

Professor in Planetary Science
 
 
 
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Contact

 

m.galand Website

 
 
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Location

 

Huxley BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Carnielli:2020:10.1016/j.icarus.2020.113918,
author = {Carnielli, G and Galand, M and Leblanc, F and Modolo, R and Beth, A and Jia, X},
doi = {10.1016/j.icarus.2020.113918},
journal = {Icarus},
pages = {1--11},
title = {Simulations of ion sputtering at Ganymede},
url = {http://dx.doi.org/10.1016/j.icarus.2020.113918},
volume = {351},
year = {2020}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Ganymede's surface is subject to constant bombardment by Jovian magnetospheric and Ganymede's ionospheric ions. These populations sputter the surface and contribute to the replenishment of the moon's exosphere.Thus far, estimates for sputtering on the moon's surface have included only the contribution from Jovian ions. In this work, we have used our recent model of Ganymede's ionosphere Carnielli et al., 2019 to evaluate the contribution of ionospheric ions for the first time. In addition, we have made new estimates for the contribution from Jovian ions, including both thermal and energetic components.For Jovian ions, we find a total sputtering rate of 2.2 × 1027 s−1, typically an order of magnitude higher compared to previous estimates. For ionospheric ions, produced through photo- and electron-impact ionization, we find values in the range 2.7 × 1026–5.2 × 1027 s−1 when the moon is located above the Jovian plasma sheet. Hence, Ganymede's ionospheric ions provide a contribution of at least 10% to the sputtering rate, and under certain conditions they dominate the process. This finding indicates that the ionospheric population is an important source to consider in the context of exospheric models.
AU  - Carnielli,G
AU  - Galand,M
AU  - Leblanc,F
AU  - Modolo,R
AU  - Beth,A
AU  - Jia,X
DO  - 10.1016/j.icarus.2020.113918
EP  - 11
PY  - 2020///
SN  - 0019-1035
SP  - 1
TI  - Simulations of ion sputtering at Ganymede
T2  - Icarus
UR  - http://dx.doi.org/10.1016/j.icarus.2020.113918
UR  - https://www.sciencedirect.com/science/article/pii/S0019103520302967?via%3Dihub
UR  - http://hdl.handle.net/10044/1/80611
VL  - 351
ER  -
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