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Science 26 November 1965:
Vol. 150. no. 3700, pp. 1156 - 1158
DOI: 10.1126/science.150.3700.1156
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Articles

Mars: Compatible Determinations of Surface Pressure through Particle Scattering

J. A. Greenspan 1

1 Astro Sciences Center, IIT Research Institute, Chicago, Illinois 60616

The number of scattering particles required to bring the visual polarimetric and ultraviolet photometric estimates of the surface pressure of Mars into agreement are calculated. Concentrations of 108 to 109 ice particles,0.2 micron in diameter, per square-centimeter column are obtained. Based on concentrations of Aitken nuclei in the atmosphere of Earth, a layer less than 100 meters thick would contain the required number of particles. The compatible pressures obtained in this manner for various N2-CO2 and Ar-CO2 atmospheric models lie within the range of pressures determined spectroscopically.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)