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The Infrared Radiometer experiment on the Solar Mesosphere Explorer satellite has been continuously measuring the 6.8‐µm thermal emission from the stratospheric aerosol from the El Chichon volcano since the time of eruption in early April, 1982. Inversion results for the zonally‐averaged infrared extinction coefficient in height, latitude, and time show that the aerosol increased in mass to a maximum of 8 Tg(8×1012gm) about 15 weeks after the April 4 eruption. It descended in height with an average speed consistent with the gravitational settling time of particles with a diameter of about 1.4 µm.
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Thomas et al. (1983) studied this question.
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