The wavelength dependence of the lunar phase curve as seen by the Lunar Reconnaissance Orbiter wide-angle camera

摘要: [1] The Lunar Reconnaissance Orbiter wide-angle camera measured the bidirectional reflectances of two areas on Moon at seven wavelengths between 321 and 689 nm phase angles 0° 120°. It is not possible to account for curves unless both coherent backscatter shadow hiding contribute opposition effect. For analyzed highlands area, contributes nearly 40% in UV, increasing over 60% red. This conclusion supported by laboratory measurements circular polarization ratios Apollo regolith samples, which also indicate that Moon's effect contains a large component backscatter. The angular width lunar almost independent wavelength, contrary theories which, Moon, predict should be proportional square wavelength. When added body other experimental evidence, this lack wavelength dependence reinforces argument our current understanding incomplete or perhaps incorrect. shown reddening caused increased contribution interparticle multiple scattering as albedo increase. Hence, cannot neglected photometric analyses. A simplified semiempirical reflectance function proposed four free parameters mathematically simple straightforward invert. valid everywhere less than about 120°, except viewing incidence close limb, terminator, poles.