Ion flux at Ganymede

Details Ion flux at Ganymede Ion flux at Ganymede

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufm.p11d1612c&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #P11D-1612

Physics

[0654] Electromagnetics / Plasmas

Scientific paper

We present new estimates of high energy ion flux onto Ganymede's surface. We also present an estimate of the ion sputtering (erosion) rate and map the distribution of sputtered water molecules. We evaluate the hypothesis that ion sputtering is responsible for Ganymede's bright polar caps. The results are also compared to newly-analyzed Galileo UV reflectance data (Hendrix et al., this session). The high energy (>50 keV) ion flux was calculated by combining plasma dynamic and particle tracing models. The multi-fluid model (Paty et al., 2008) provided the electric and magnetic fields for the particle tracing model, which calculates the trajectories of high energy ions. Sputtering rates are provided by fits to laboratory data (e.g., Fama et al., 2008), which give sputtering yields as a function of ion species and energy. The sputter redistribution of water molecules is calculated using the method described by Tiscareno and Geissler (2003). Fama , M., Shi, J., Baragiola, R.A., 2008. Sputtering of ice by low-energy ions. Surf. Sci. 602, 156-161. Paty et al., 2008. Ion energization of Ganymede's magnetosphere: Using multifluid simulations to interpret ion energy spectrograms. JGR 113. Tiscareno, M.S., Geissler, P.E., 2003. Can redistribution of material by sput- tering explain the hemispheric dichotomy of Europa? Icarus 161, 90- 101.

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