Other
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008epsc.conf..221k&link_type=abstract
European Planetary Science Congress 2008, Proceedings of the conference held 21-25 September, 2008 in Münster, Germany. Online a
Other
Scientific paper
ABSTRACT BepiColombo is one of the cornerstone missions of ESA to investigate Mercury. The mission consists of two orbiters, one for studying Mercury's magnetosphere (MMO) and the other for investigating the planet itself (MPO). MPO includes the laser altimeter BELA whose main goals are the mapping of the long-wavelength topography and retrieving time-dependent variations of Mercury's surface. Due to its proximity to the Sun tidal elevations ofMercury's surface of order one meter are likely, if the planet's core is partly liquid. The tidal amplitude is characterized by the tidal Love number h2. Its quantity reveals information on the interior structure of Mercury such as the thickness of the liquid outer core. In previous simulations, Mercury's topography data from synthetic laser altimeter records have directly been decomposed into a spherical harmonic expansion. In this work, we test a decomposition of the data using a rectangular grid. In latitudinal direction, the basis functions are simple step functions which are only non-zero for a particular grid cell. In longitudinal direction, the basis functions are either step functions, linear functions, or more sophisticated interpolations. This choice of basis functions is well suited for the nearly polar orbit of MPO which makes laser shots very dense in latitudinal direction but less dense in longitudinal direction. We show first results on the extraction of the global topography and the tidal Love number h2.
Christensen Ulrich R.
Kallenbach Reinald
Koch Ch.
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