Stratospheric aerosols properties from earth limb photography

Physics

Scientific paper

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Aerosols, Atmospheric Scattering, Balloon-Borne Instruments, Earth Limb, Particle Size Distribution, Stratosphere, Cameras, Forward Scattering, Rayleigh Scattering, Solar Radiation, Volcanoes

Scientific paper

Aerosol abundance and size distributions at various altitudes in the stratosphere are determined by means of balloon-borne observation, at three wavelengths of visible sunlight that have been scattered by the earth limb. In keeping with their strong forward-scattering properties, aerosols re-emit little light at an azimuth angle 180 deg away from the direction of the sun. The limb radiance observed in this case is used to subtract Rayleigh scattering, and to isolate aerosol scattering at all azimuths angle 180 deg away from the direction of the sun. The limb radiance observed in this case is used to subtract Rayleigh scattering, and to isolate aerosol scattering at all azimuths while taking into account the Rayleigh phase function. The data obtained confirm that the phase function can, within experimental uncertainties, be represented by the Henyey-Greenstein function. The stratospheric aerosol size dealt with is in the range 0.04-0.4 microns.

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