Abstract
Abstract The behaviour of stratospheric aerosols formed after the eruption of Mt. Pinatubo has been studied by a simple and inexpensive ground-based technique. The technique involves measurements of the scattered sky radiation intensity during twilight in the near IR region. Several interesting results have been obtained. Sometimes a single aerosol layer, and sometimes multiple aerosol layers, have been seen. The bottom height of the single layer has been found to vary from about 18 km to 25 km. The thickness of this layer also changes from about 6 km to 12 km. The magnitude of the aerosol feature became a maximum towards the end of December 1991 and at the beginning of January 1992, and decreased thereafter.
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