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[19.12] Static Structure Factor Effects on Theoretical Emissivity Profiles of Martian Surface Dust

K. M. Pitman (Louisiana State University; Space Science Inst.), M. J. Wolff (Space Science Institute), G. C. Clayton (Louisiana State University)

We continue our exploration of the behavior of Martian surface emissivity spectra in response to four fundamental particle microphysical properties (particle size, shape, surface roughness, and packing fraction) for micron-sized dust grains. In this work, we focus on the influence of the static structure factor [1, 2] on single-scattering albedo, particle scattering phase function, and asymmetry parameter for a variety of Mars-relevant effective grain radii in the thermal IR (TES, Odyssey) wavelength regime. By using modified single-scattering input parameters, we effectively use clusters of particles to determine reasonable packing fraction values for a theoretical planetary regolith. We compare our radiative transfer formulation to that of Mackowski's multisphere code (SCSMFO) [3]. The effects of packing fraction may also be examined experimentally by varying the compression of laboratory samples; we briefly discuss planned experiments.

This work is supported through NASA MDAP (MJW) and LSU Board of Regents (KMP).

[1] Mishchenko, M. I. (1994) JQSRT, 52, 1, 95-110. [2] Mishchenko, M. I., & Macke, A. (1997) JQSRT, 57, 1, 767-794. [3] Mackowski, D. W. (1994) J. Opt. Soc. Am. A, 11, 2851-2861.

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Bulletin of the American Astronomical Society, 35 #4
© 2003. The American Astronomical Soceity.