Accession Number:

AD0630076

Title:

THE COMPOSITION OF THE MARTIAN SURFACE,

Descriptive Note:

Corporate Author:

AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS

Report Date:

1965-04-01

Pagination or Media Count:

28.0

Abstract:

It is generally believed that the desert areas of Mars are composed of limonite. This belief, which is based upon polarimetric, spectrometric, color, and albedo measurements, is in conflict with geologic reasoning. An examination of the evidence for limonite on Mars shows that the spectrometric measurements are most convincing. Laboratory experiments demonstrate, however, that the infrared emission spectra of minerals depend in part on grain size. Finely powdered minerals have infrared emission characteristic of a greybody, and yield very little spectral information. Thus, the Martian surface materials could be composed primarily of fine-grained silicates, or of coarse-grained silicates coated with finely divided limonite, without their presence being revealed spectrometrically. Author

Subject Categories:

  • Astrophysics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE