Testing the Hapke Model for the Optical Effects of Space Weathering

Details Testing the Hapke Model for the Optical Effects of Space Weathering Testing the Hapke Model for the Optical Effects of Space Weathering

Jan 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002assl..278....5b&link_type=abstract

Solar System Remote Sensing, p. 5

Astronomy and Astrophysics

Astronomy

Optical Properties, Space Weathering, Lunar Soil, Astronomical Models, Computerized Simulation, Grain Size, Vapor Deposition, Coatings, Glass

Scientific paper

In the Apollo era, Hapke and colleagues used simulation experiments and theoretical considerations to argue for the importance of vaporphase coatings in causing lunar soils to darken and redden with age. During the 1990s, direct detection of vapor-deposited iron on actual lunar soil grains came from the work of Keller and associates. These workers discovered that most soil grains have coatings, some of which differ from the interior composition. The morphology of the coatings is such that they must have condensed from a vapor. The coatings and grain rims typically contain abundant submicroscopic iron particles (SMFe). While SMFe is largely responsible for the reddening of lunar soil, Hapke's work suggests that it alone does not account for the changes accompanying soil maturity. For example, Hapke found that the inclusion of dark glass was required in addition to submicroscopic iron to account for weathering trends. Using a different formalism, Shkuratov et al. emphasized the importance of known particle size evolution in maturation modeling to match observed space weathering trends. Therefore Hapke's ground-breaking work must be followed up to show how the model glass content and composition and grain size evolution required to fit observed data compare to measured soil properties.

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