Physics
Scientific paper
Feb 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979icar...37..389t&link_type=abstract
Icarus, vol. 37, Feb. 1979, p. 389-398.
Physics
6
Mars Photographs, Mars Surface, Planet Ephemerides, Atmospheric Scattering, Interstellar Extinction, Mars Craters, Phase Shift, Ubv Spectra, Viking Orbiter 1, Phase Angles, Imagery, Observations, Mars, Opposition, Brightness, Albedo, Viking 1 Orbiter, Surface, Martian, Wavelengths, Spectral Reflectivity, Crater Streaks
Scientific paper
Low phase angle observations in the Chryse-Acidalia region have been obtained by the Viking Orbiter 1 spacecraft under clearer atmospheric conditions than reported earlier. A variety of surface features were recorded, e.g., crater streaks, dark and bright patches. Several findings for this scene include: an abrupt brightness increase (10%) was found at phase angles less than 3 deg, an effect dependent on surface albedo and possibly particle distribution; a slight weakening of reflectance surge with decreasing wavelengths; a larger opposition effect for features of high albedo was recorded; and a greater reddening with increased phase angle took place for low albedo regions. Both reflectance and contrast values are provided at three wavelengths as a function of phase angle from 0.15 to 20 deg.
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