Abstract
Material from the eruption of Mount St Helens (46°N, 122°W) has been detected at lower stratospheric heights using a laser-radar system at Winkfield (51°N, 1°W). The observation of a distinct layer of ∼1 km thickness near 15.5 km altitude for several days in early June is consistent with the west–east transport of material from above the eruption site expected at this height and also indicates a significant northward spread of the material. In late July less pronounced layers were observed at 17–18 km and 22 km at which level the direction of motion is less certain.
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