Data in this database are freely available under the request of citation of   this paper   and the  paper   in which the data were published.
JSC Puyehue Volcanic Ash

origin the Puyehue ash sample corresponds to the June 2011 Puyehue-Cordón Caulle complex eruption. The sample was collected at a distance of around 150 km in the Comallo region
main constituent rhyolitic obsidian
particle size measured size distributions
Mie: reff=8.6 μm, veff=2.2
Fraunhofer: reff=5.0 μm, veff=4.4
particle shape irregular
refractive index 1.48 + i0.00027 (647nm) (Pollack et al. 1973)
color light gray
scattering matrix 647 nm
article Merikallio S, Muñoz O, Sundstrom A-M, Virtanen TH, Horttanainen M, de Leeuw G, Nousiainen T. Optical modeling of volcanic ash particles using ellipsoids. JGR Atmospheres DOI: 10.1002/2014JD022792