Ion and Electron Radiolysis of Europa's Surface

Details Ion and Electron Radiolysis of Europa's Surface Ion and Electron Radiolysis of Europa's Surface

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm...p52a11p&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #P52A-11

Other

2716 Energetic Particles, Precipitating, 2732 Magnetosphere Interactions With Satellites And Rings, 6218 Jovian Satellites, 6220 Jupiter

Scientific paper

We investigate the role of magnetospheric ion and electron bombardment in the radiolysis of Europa's surface. In this study we pay particular attention to the energetics of particle transport in the upper layer of ice (<1m). Data from the Galileo Energetic Particles Detector (EPD) and the Voyager 2 Low Energy Charged Particle (LECP) detector will be included. The Galileo measurements were made during the several near encounters with Europa. These data have been corrected for penetrating background and instrument saturation and degradation effects. The Voyager 2 electron data were taken during the inbound and outbound Jupiter passes, when the spacecraft was near Europa's orbit. Electron and ion energy spectra will be presented. We also consider the radiation dose deposited by the incident charged particles in the upper layer of Europa's icy surface. These energy spectra are used as inputs to a simulation that calculates radiation dose versus depth. Results of this calculation for a pure water ice surface, including the contributions from bremsstrahlung, will be presented. The energy deposition rate into ice is found to be dominated at different depths alternately by electrons and ions. These data are presented as energy density deposited so they can be scaled and applied to other materials. In this presentation, the role these particles play in radiolytic processing of ice and non-ice regions and their role in determining the leading/trailing and other observational asymmetries will be discussed.

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