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- W858165921 abstract "Following the May 18, 1980, eruption of Mount St. Helens, photometric and photograhic observations were taken at Boulder, Colorado, to record the optical effects of volcanic dust atmospherically transported to this area. The instruments used included a narrow-beamwidth solar photometer which recorded solar irradiance in eight narrow-bandwidth channels in the wavelength range 0.3 to 1.1 microns, a solar aureole photometer, and two time-lapse camera systems. The eight-channel solar photometer data have been analyzed to obtain the wavelength dependence of optical thickness. At the longer wavelengths, on May 20, 1980, the optical thickness was as much as nine times that expected from a 'clean atmosphere' model. During the first several days following the eruption, the dust veil sometimes exhibited sufficient spatial structure that its motion can be seen on the time-lapse films. The results of analysis to date are presented and the plans for additional analysis are outlined." @default.
- W858165921 created "2016-06-24" @default.
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- W858165921 date "1982-10-01" @default.
- W858165921 modified "2023-09-23" @default.
- W858165921 title "Mount St. Helens dust veil observed at Boulder, Colorado by optical techniques" @default.
- W858165921 hasPublicationYear "1982" @default.
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