Statistics – Applications
Scientific paper
Oct 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002phdt........10k&link_type=abstract
Thesis (PhD). HELSINGIN YLIOPISTO (FINLAND), Source DAI-C 64/02, p. 435, Summer 2003, 98 pages.
Statistics
Applications
1
Scientific paper
The study of the surface materials of small solar system objects can provide us with information on their origin and evolution as well as the early stages of the entire solar system. One way to study the surface texture of these objects is to investigate the directional properties of the light scattered from them. The method also has applications in remote sensing of terrestrial surfaces. This thesis aims to improve the methods of solar system remote sensing by the study of the photometric and polarimetric properties of light scattered as a function of phase angle, especially near the direction of the source. The current methods of phase curve interpretation are evaluated and restrictions of the whole approach are discussed. It is pointed out that a conclusive phase curve interpretation requires a stronger empirical approach. This includes systematic laboratory measurements and empirical modelling of data. A novel laboratory device is constructed and results on backscattering are presented for ices and regolith-type samples. Phenomena similar to those found for many solar system ices and regoliths are observed with laboratory samples and terrestrial ices. These results are an important addition to the present supply of experimental data. They also are a starting point to a collection of a whole library of measurements, which is needed for extensive conclusions on surface properties. Methods of empirical modelling are presented and applied to the phase curves of icy satellites, asteroids, and laboratory samples. Empirical modelling is a powerful tool in the comparative classification of phase curve properties such as the amplitude and width of the backscattering intensity peak. The results presented in this thesis provide new prospects for more conclusive interpretation of phase curves. The main focus of the study has thus far been laid on modelling, and only diverse information has been derived from phase curves. The experimental approach is essential in improving the general view on the opposition effect and testing and applying the physical models. A reliable means for retrieving surface properties from phase curves must be established to make their study a powerful remote sensing tool.
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