Categories
TERRESTRIAL AEROSOLS
Summary: AEROSOLS
Micron- cosmic analogs subcategories
Asteroids
Circumstellar shells
Comets
Terrestrial Aerosols Subcategories
Volcanic
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 constituent
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 Fraunhofer: reff (μm)
4.1
Particle size Fraunhofer: veff
9.5
Size distribution plot
Size distribution table
Particle shape
irregular
All SEM images (zip file)
Refractive index
estimated to be in the range [1.48-1.56] + i0.0018
Color
light gray
Scattering matrix (1) wavelength in nm
632.8
Scattering matrix (1) plot
Scattering matrix (1) table
Angle range (deg)
[3,173]
Paper (pdf)
Full reference paper
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
BibTeX