Evolution of space weathering and its components – effect of solar wind and microimpacts on reflectance spectra of airless planetary surfaces
| Thesis title in Czech: | Vývoj kosmického zvětrávání a jeho komponent – efekt slunečního větru a mikroimpaktů na reflektanční spektra povrchu planetárních těles bez atmosféry |
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| Thesis title in English: | Evolution of space weathering and its components – effect of solar wind and microimpacts on reflectance spectra of airless planetary surfaces |
| Key words: | kosmické zvětrávání|sluneční vítr|mikroimpakty|spektra |
| English key words: | space weathering|solar wind|micrometeoroid impacts|spectra |
| Academic year of topic announcement: | 2022/2023 |
| Thesis type: | rigorosum thesis |
| Thesis language: | angličtina |
| Department: | Astronomical Institute of Charles University (32-AUUK) |
| Supervisor: | doc. Mgr. Josef Ďurech, Ph.D. |
| Author: | hidden - assigned and confirmed by the Study Dept. |
| Date of registration: | 03.04.2023 |
| Date of assignment: | 03.04.2023 |
| Confirmed by Study dept. on: | 03.04.2023 |
| Date and time of defence: | 11.04.2023 00:00 |
| Date of electronic submission: | 03.04.2023 |
| Date of submission of printed version: | 03.04.2023 |
| Date of proceeded defence: | 11.04.2023 |
| Guidelines |
| Objectives:
Study of space weathering components using lunar swirl and asteroid data (for example asteroid Itokawa observations and sample return) - Evaluation of differences in solar wind and cosmic dust microimpacts on evolution and optical effects of space weathering. - Experimental verification of observations and model data through laboratory space weathering simulations with minerals, meteorites, and lunar regolith simulant materials. Research plan: The doctoral project will be conducted as a joint supervision doctoral project between MFF UK and Faculty of Science, University of Helsinki. Lunar swirls are shielded by magnetic field from solar wind, but not from microimpact bombardment. As space weathering related to microimpacts of dusty grains is amplified here, it is possible to study optical changes related to microimpacts. In contrast, samples from Itokawa asteroid delivered by Hayabusa spacecraft are predominantly subjected to radiation damage caused by solar wind and related optical changes can be studied here. These trends will be studied using lunar remote sensing data (M3 spectrometer data from Chandrayaan-1 spacecraft) and empirically (reflectance spectra measurements of Itokawa sample return). Furthermore, laboratory space weathering simulations using ion and dust bombardment) will be done with mineral samples to verify these trends. The observed spectral changes will be subject to light scattering modelling (using existing SIRIS code with custom modifications) in order to relate optical effects to distinct products of space weathering observed on the lunar and Itokawa regolith particles (metallic nanoparticles, blistering). Experimental work will be done at Department of Physics, University of Helsinki which is fully equipped to do these tasks. Financing of this work will be gathered from Finnish grant foundations. |
| References |
| Hapke, B., 2001. Space weathering from Mercury to the asteroid belt. Journal of Geophysical Research 106, 10039-10073.
Hiroi, T., Abe, M., Kitazato, K., Abe, S., Clark, B.E., Sasaki, S., Ishiguro, M., Barnouin-Jha, O.S., 2006. Developing space weathering on the Asteroid 25143 Itokawa. Nature 443, 56–58. doi:10.1038/nature05073. Kohout T., Čuda J., Filip J., Britt D., Bradley T., Tuček J., Skála R., Kletetschka G., Kašlík J., Malina O., Šišková K, and Zbořil R. (2014): Space weathering simulations through controlled growth of iron nanoparticles on olivine. Icarus, 237C, 75-83. DOI: 10.1016/j.icarus.2014.04.004 Noguchi T., Nakamura T., Kimura M., et al., 2011. Incipient Space Weathering Observed on the Surface of Itokawa Dust Particles. Science 333. 1121-1125. doi: 10.1126/science.1207794. Pieters, C.M., Taylor, L.A., Noble, S.K., Keller, L.P., Hapke, B., Morris, R.V., Allen, C.C., McKay, D.S., Wentworth, S., 2000. Space weathering on airless bodies: Resolving a mystery with lunar samples. Meteoritics and Planetary Science 35, 1101-1107. Sasaki, S., Kurahashi, E., Yamanaka, C., Nakamura, K., 2003. Laboratory simulation of space weathering: Changes of optical properties and TEM/ESR confirmation of nanophase metallic iron. Advances in Space Research 31, 2537-2542. doi: 10.1016/S0273-1177(03)00575-1 |