Visible and near infrared spectroscopy of Mercury and Venus from orbit
1University of Oulu, Faculty of Science, Astronomy
2Institute for Planetary Research German Aerospace Center (DLR)
|Online Access:||PDF Full Text (PDF, 42.1 MB)|
|Persistent link:|| http://urn.fi/urn:isbn:9789526215068
|Publish Date:|| 2017-02-16
|Thesis type:||Doctoral Dissertation
|Defence Note:||Academic dissertation to be presented with the assent of the Doctoral Training Committee for Technology and Natural Sciences on Friday, 31st of March, starting at 12:00 in the lecture hall IT115 at the Linnanmaa campus at the University of Oulu.
Professor Jürgen Schmidt
Doctor Jörn Helbert
Doctor Thomas Widemann
Doctor Colin Wilson
Doctor Johannes Benkhoff
Professor Jürgen Schmidt
The present thesis exposes methods and results obtained exploiting information provided by visible and near-infrared spectra over Mercury and Venus. We use information from different datasets to perform a geologically supervised investigation, in order to identify the presence of compositional heterogeneities and reconstruct the stratigraphy in the shallow crust of the two Terrestrial planets. We name these procedures “Datasets Fusion Techniques” (DFTs). We combine the MASCS dataset with the MDIS dataset from the MESSENGER mission to analyze the local and global crustal properties of Mercury. We select all MASCS observations contained within geologic units previously mapped using high-resolution MDIS NAC images. Similarly, we combine the Venus Express VIRTIS dataset with Magellan SAR imaging dataset for identifying location and extent of the recently active lava flows possibly responsible for the relatively high 1 μm emissivity anomalies observed by the VIRTIS instrument on Idunn Mons on Venus. Using a forward modeling-like procedure, we mapped a number of lava flows on Magellan SAR images, then assigning them a different value of simulated emissivity at each iteration. We found one non-unique solution which well approximates VIRTIS observations. This thesis is a comprehensive study which embraces three main research works performed during the current PhD project. The results show the occurrence of vertical and horizontal heterogeneities in the composition of the shallow crust of Mercury, providing as well important indications for the presence of N-S dichotomy. We also found that the recently active lava flows on Idunn Mons are most likely flank flows located on the eastern flank of the volcanic structure. We could finally reconstruct the stratigraphy beneath the local scale study areas of Mercury and Venus. This PhD thesis demonstrates that DFTs can be used as a powerful expedient for improving the quality of information we can achieve from remote sensing analyses.
Report series in physical sciences
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