The continuum slope of Mars - Bidirectional reflectance investigations and applications to Olympus Mons

Details The continuum slope of Mars - Bidirectional reflectance investigations and applications to Olympus Mons The continuum slope of Mars - Bidirectional reflectance investigations and applications to Olympus Mons

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993icar..102..185f&link_type=abstract

Icarus (ISSN 0019-1035), vol. 102, no. 2, p. 185-202.

Astronomy and Astrophysics

Astronomy

49

Bidirectional Reflectance, Mars Surface, Mars Volcanoes, Mineral Deposits, Surface Properties, Imaging Spectrometers, Infrared Astronomy, Iron Compounds, Mars, Olympus Mons, Reflectance, Laboratory Studies, Experiments, Mixing, Parameters, Particles, Texture, Geometry, Wavelength, Grain Size, Dust, Continuum Slope, Ism Instrument, Spectrometry, Duricrust, Eolian Effects, Surface, Transport, Procedure, Spectra, Thickness, Viking Missions, Spacecraft Observations, Ferric Material, Near-Infrared, Compaction, D

Scientific paper

Two primary causes of near-IR continuum slope variations have been observed in an investigation of the bidirectional reflectance characteristics of ferric coatings on the continuum slope of Mars. First, the presence of a thin ferric coating on a dark substrate produces a negative continuum slope due to the wavelength-dependent transparency of the ferric coating. Second, wavelength-dependent directional reflectance occurs when the surface particles are tightly packed, particle sizes are on the order of or smaller than the wavelength of light, or the surface is otherwise smooth on the order of the wavelength of light. Based on these results, the annuli on the flanks of Olympus Mons which are defined by reflectance and continuum slope are consistent with spatial variations in surface texture and possibly with spatial variations in the thickness of a ferric dust coating or rind.

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