Evidence for haematite particles at 60 km altitude

Details Evidence for haematite particles at 60 km altitude Evidence for haematite particles at 60 km altitude

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984natur.310..216b&link_type=abstract

Nature (ISSN 0028-0836), vol. 310, July 19, 1984, p. 216-218.

Computer Science

7

Atmospheric Composition, Cosmic Dust, Hematite, Ionospheric Composition, Atmospheric Attenuation, Linear Polarization, Particle Size Distribution

Scientific paper

Analytical evidence is presented that the dust layer which may exist at an altitude of 60 km consists of particles of haematite with radii around 200 A. The data of Ackerman et al. (1982) are applied to the analysis. The ratio of absorption cross-section at 0.44 and 0.65 microns is shown for haematite spheres of varying radius, and the degree of linear polarization acquired by initially unpolarized light upon scattering by small spheres, randomly oriented disks, and randomly oriented needles is presented. It is argued that only haematite in the form of small particles can give the measured 10-fold increase in extinction over the 0.65-0.44 micron range.

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