SKM 2023 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 13: Focus Session: Ion Beam Interaction with Surfaces and 2D Materials II

O 13.1: Topical Talk

Montag, 27. März 2023, 15:00–15:30, GER 38

Space weathering of planetary surfaces — •Peter Wurz — Physics Institute, University of Bern, Bern, Switzerland

The surfaces of planetary objects in interplanetary space are subjected to external agents modifying their chemical and mineralogical composition and causing removal of material from these surfaces into interplanetary space. These external agents are the flow of ions and electrons from the Sun (the solar wind), currents of magnetospheric systems, energetic particles from outer space, impacting micro-meteorites, and photons from the Sun. In particular, the ion precipitation on these surfaces is of high interest. The removal of surface material, e.g., the ion-induced sputtering, contributes atoms to the interplanetary particle population, which eventually end up as ions in the interplanetary plasma flow. The changes in composition of the surface are also of interest because they affect the spectroscopic appearance of these surfaces. Since most of the planetary objects are only studied via telescopic observations, relating the spectroscopic appearance of the space-weathered surface to the underlying material is of high importance.