Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufm.p23c0077w&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #P23C-0077
Physics
5464 Remote Sensing, 5470 Surface Materials And Properties
Scientific paper
Bidirectional reflectance measurements of two particulate olivine and pyroxene samples were acquired at many different incidence, emission, and phase angles. These data were acquired in the principal plane using a spectrogoniometer consisting of two independent arms, a reflectance spectrometer that operates from 0.35 - 2.5 micrometers, and a collimated light source. Hapke photometric model parameters [Hapke 1981, 1993, 2002] were fit to these bidirectional reflectance measurements with a phase angle of 3 to 140°. Initial results indicate that the olivine samples are forward scattering and the pyroxene samples are backscattering. Internal fractures along cleavage planes in the pyroxene grains appear to act as internal scatterers that redirect light into the back scattered direction. Analyses of ground based Opportunity rover data and OMEGA orbital data at Meridiani Planum [e.g., Arvidson et al., 2006] suggest that olivine is spectrally under represented in the VNIR. The difference in scattering behavior of olivine and pyroxene could contribute to the underrepresentation of olivine in spectral data acquired in back scattering geometries if more back scattering minerals, such as pyroxene, are also present.
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