Abstract
The Thermal Emission Spectrometer spectra of low albedo surface materials suggests that a four to one mixture of pyroxene to plagioclase, together with about a 35 percent dust component provides the best fit to the spectrum. Qualitative upper limits can be placed on the concentration of carbonates (<10 percent), olivine (<10 percent), clay minerals (<20 percent), and quartz (<5 percent) in the limited regions observed. Limb observations in the northern hemisphere reveal low-lying dust hazes and detached water-ice clouds at altitudes up to 55 kilometers. At an aerocentric longitude of 224°a major dust storm developed in the Noachis Terra region. The south polar cap retreat was similar to that observed by Viking.
Original language | English (US) |
---|---|
Pages (from-to) | 1692-1696 |
Number of pages | 5 |
Journal | Science |
Volume | 279 |
Issue number | 5357 |
DOIs | |
State | Published - Mar 13 1998 |
ASJC Scopus subject areas
- General