Light Scattering by Lunar Exospheric Dust: What could be Learned from LRO LAMP and LADEE UVS?

Details Light Scattering by Lunar Exospheric Dust: What could be Learned from LRO LAMP and LADEE UVS? Light Scattering by Lunar Exospheric Dust: What could be Learned from LRO LAMP and LADEE UVS?

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufm.p13d1713g&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #P13D-1713

Physics

Plasma Physics

[5465] Planetary Sciences: Solid Surface Planets / Rings And Dust, [6250] Planetary Sciences: Solar System Objects / Moon, [7849] Space Plasma Physics / Plasma Interactions With Dust And Aerosols

Scientific paper

Two complementary spectrometers, namely the Lunar Reconnaissance Orbiter, Lyman Alpha Mapping Project (LAMP) and the planned Lunar Atmosphere and Dust Environment Explorer (LADEE) Ultraviolet Explorer (UVS) will carry out sensitive searches for high altitude exospheric dust, via detection of scattered sunlight. The combined spectral coverage of these instruments extends from far-UV to near-IR wavelengths. Over this wavelength range, grain size parameter (X=2πr/λ, with r the grain radius and λ the wavelength) changes dramatically, which makes broad wavelength coverage a good diagnostic of grain size. Utilizing different pointing geometries, both LAMP and UVS are able to observe dust over a range of scattering angles, as well as measure the dust vertical profile via limb measurements at multiple tangent heights. We summarize several categories of information that can be inferred from the data sets, using broadband simulations of horizon glow as observed at the limb. Grain scattering properties used in these simulations were computed for multiple grain shapes using Discrete-Dipole theory. Some cautionary remarks are included regarding the use of Mie theory to interpret scattering measurements.

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