On the albedo of the interplanetary dust

The zodiacal light brightness and measured spatial density of the interplanetary dust lead to a mean geometric albedo of 0.24 for the dust particles near 1 AU; whereas the composition of collected micrometeroids suggests a geometric albedo of less than or approximately equal to 0.1. The data do not support the very low albedo (0.01 or less) proposed by Cook (1978). The evidence is against a change in the mean particle albedo between 0.1 and 2 AU. Beyond 2 AU, the data are unclear and a change in albedo is not ruled out.