Data in this database are freely available under the request of citation of this paper and the paper in which the data were published.
Mount St. Helens
| origin | Mount St. Helens volcano in southwest Washington, USA. The particles were collected 6 km north of the crater after a large eruption on 18 May 1980. The coarse fraction was removed by sieving |
| main constituents | 64 wt% glass, plagioclase feldspar, opx, amphibole, magnetite, ilmenite, cpx |
| practical significance | interpretation of remote sensing data. Analogues of other planets' atmospheric dust, and dust in comets, asteroids, and circumstellar shells |
| particle size | measured size distributions Fraunhofer: reff=4.1 μm, veff=9.5 |
| particle shape | irregular |
| refractive index | estimated to be in the range [1.48-1.56] + i0.0018 |
| color | light gray |
| scattering matrix | 632.8 nm |
| article | Muñoz O,Volten H, Hovenier JW, Veihelmann B, van der Zande WJ, Waters LBFM, Rose WI. Scattering matrices of volcanic ash particles of Mount St. Helens, Redoubt, and Mount Spurr Volcanoes. Journal of Geophysical Research, vol. 109, D16201, 2004 |
