Stratospheric Aluminum Oxide

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Science  26 Mar 1976:
Vol. 191, Issue 4233, pp. 1270-1271
DOI: 10.1126/science.191.4233.1270


Balloons and U-2 aircraft were used to collect micrometer-sized strato-spheric aerosols. It was discovered that for the past 6 years at least, aluminum oxide spheres have been the major stratospheric particulate in the size range 3 to 8 micrometers. The most probable source of the spheres is the exhaust from solid-fuel rockets.