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In this study, we explore the impact of inhomogeneities in the spatialdistribution of interstellar dust on spatial scales of $\le1$ au caused by ionshadowing forces on the optical properties of diffuse interstellar medium (ISM)as well as on the dust temperature. We show that recently proposed possibilitythat interstellar dust grains in the diffuse ISM are grouped in sphericalcloudlets (clumps) may significantly affect the observed optical properties ofthe diffuse ISM in comparison to that calculated under the commonly acceptedassumption on the uniform dust/gas mixture if the size of clumps $\gtrsim0.1$au. We found that opacity of an arbitrary region of diffuse ISM quicklydecreases with growth of dusty clumps. We also studied the dependence ofopacity and dust temperature inside the dusty clumps on their size. We showthat the clumps larger than 0.1 au are opaque for far ultraviolet radiation.Dust temperature exhibit a gradient inside a clump, decreasing from the edge tothe center by several degrees for a clump of a size of 0.1 au and larger. Weargue that dust temperatures and high opacity within clumps larger than 0.1 aumay facilitate somewhat more efficient synthesis of molecules on surfaces ofinterstellar grains in the diffuse ISM than it was anticipated previously. Onthe other hand, the presence of clumps with sizes below 0.1 au makes small ornegligible influence on the optical properties of the diffuse ISM in comparisonto the case with uniform dust/gas mixture.

Optical properties and dust temperatures in clumpy diffuse medium