Analysis of Mount St. Helens ash from optical photoelectric photometry

Details Analysis of Mount St. Helens ash from optical photoelectric photometry Analysis of Mount St. Helens ash from optical photoelectric photometry

Jul 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983pasp...95..451c&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 95, July 1983, p. 451-456.

Astronomy and Astrophysics

Astronomy

3

Ashes, Atmospheric Attenuation, Electrophotometry, Particle Size Distribution, Visible Spectrum, Volcanoes, Interstellar Extinction, Mie Scattering, Optical Properties, Pollution Transport, Stellar Spectrophotometry

Scientific paper

The optical properties of suspended dust particles from the eruption of Mt. St. Helens on July 23, 1980 are investigated using photoelectric observations of standard stars obtained on the 0.76-m telescope at the University of Washington 48 hours after the eruption. Measurements were made with five broad-band filters centered at 3910, 5085, 5480, 6330, and 8050 A on stars of varying color and over a wide range of air masses. Anomalous extinction effects due to the volcanic ash were detected, and a significant change in the wavelength-dependent extinction parameter during the course of the observations was established by statistical analysis. Mean particle size (a) and column density (N) are estimated using the Mie theory, assuming a log-normal particle-size distribution: a = 0.18 micron throughout; N = 1.02 x 10 to the 9th/sq cm before 7:00 UT and 2.33 x 10 to the 9th/sq cm after 8:30 UT on July 25, 1980. The extinction is attributed to low-level, slowly migrating ash, possibly combined with products of gas-to-particle conversion and coagulation.

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