 |
| Titel |
Surfaces and exospheres of the icy Galilean moons - an integral approach |
| VerfasserIn |
André Galli, Peter Wurz, Audrey Vorburger, Marek Tulej, Antoine Pommerol, Jürgen Scheer, Nicolas Thomas, Olivier Mousis, Stas Barabash, Martin Wieser, Helmut Lammer |
| Konferenz |
EGU General Assembly 2014
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250089317
|
| Publikation (Nr.) |
 EGU/EGU2014-3517.pdf |
|
|
|
|
|
| Zusammenfassung |
| The JUpiter ICy moons Explorer (JUICE) will investigate Jupiter and its system with
particular emphasis on Ganymede as a planetary body and potential habitat. Europa and
Callisto flybys will allow for a comparative picture of the icy Galilean moons. As part of the
scientific preparation work for JUICE, we examine the requirements and expected science
results related to the Neutral gas and Ion Mass spectrometer (NIM), which belongs to the
Particle Environment Package on board JUICE.
Models of the exosphere profiles at Europa, Ganymede, and Callisto allow us to optimize the
design of NIM, but the reliability of the models is limited because the properties of icy
surfaces, in particular sputtering and sublimation parameters for icy regolith mixed with
carbonates or salts, are not well known.
We therefore have started a series of lab experiments with icy regolith subjected to ion and
UV irradiation in a cold vacuum. Currently, we perform irradiation experiments of pure water
ice with H+ and O+ ions. In the coming years, we will expand the experiments to more
complex cases (including UV-radiation, temperature cycles and chemical impurities
such as O2, C, S, CO2, SO2, and Na) relevant for Galilean moons. The results will
constrain exosphere models and will enable the scientific community to better link
exosphere measurements with processes in the ice and observed surface features. |
|
|
|
|
|
|