Terrain Darkening on Iapetus: An Analysis of Processes Leading to Global and Local Dichotomy Features

Computer Science

Scientific paper

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Scientific paper

We studied the insolation geometry using different models for the reflection. A model derived from [3] with a linear interpolation between lunar and Lambert-like scattering reproduced the dark patterns relatively well (Fig. 2). To understand the exact nature of the threshold necessary for the darkening process, we simulated different crater characteristics. Taking the latitude of the craters into account, we get an averaged energy flux. With the knowledge of the temperature-dependence of the sublimation (compare [4]) we can estimate the sublimation rate needed to trigger the feedback and compare it with estimates for the global process.

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