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In this paper, we discuss the problem of determination of light radiationpressure force upon an anisotropic surface. The optical parameters of such asurface are considered to have major and minor axes, so the model is called anorthotropic model. We derive the equations for force components from emission,absorption, and reflection, utilizing a modified Maxwell's specular-diffusemodel. The proposed model can be used to model a flat solar sail with wrinkles.By performing Bayesian analysis for example of a wrinkled surface, we show thatthere are cases in which an orthotropic model of the optical parameters of asurface may be more accurate than an isotropic model.

Light radiation pressure upon an optically orthotropic surface