Visible limb radiances measured by the Solar Mesosphere Explorer (SME) are used to obtain volume scattering ratios for aerosol loading in the 30-55 km altitude range of the stratosphere. Global maps of these ratios are presented for the period January, 1982 to August, 1984. Significant aerosol scattering from the ''mystery cloud'' and El Chichon aerosol layers are found above 30 km. A timescale of approximately 2 months between the appearance of the aerosol at 30.5 km and at 37.5 km is consistent with vertical transport of aerosol or vapor by eddy diffusion aerosol scattering and stratospheric temperatures may account for the formation of aerosol between 40 and 55 km altitude.