When
3:30 p.m., Jan. 29, 2008
Where
Kuiper Space Sciences 308
Jason Soderblom, LPL, will discuss: “Temporal Variations in the Size Distribution of Martian Atmospheric Dust from Mars Exploration Rover Navcam Observations.”
Abstract
The Navcams can measure forward scattering in the martian atmosphere down to scattering angles not previously attainable. Calibrated near-Sun Navcam images of the martian sky were modeled using a multiple-scattering radiative-transfer model to constrain spatial and temporal variations in the size distribution of atmospheric dust. The effective radius (reff) of dust observed by Spirit is found to be ~1.3–1.7 µm and by Opportunity ~1.4–1.8 µm (± ~0.1 µm). A positive correlation between reff and optical depth is observed. These data also provide new constraints on the effective variance (veff) of the size distribution of 0.4–0.5.
Refreshments will be served at 3:15 p.m. in the Atrium.
Abstract
The Navcams can measure forward scattering in the martian atmosphere down to scattering angles not previously attainable. Calibrated near-Sun Navcam images of the martian sky were modeled using a multiple-scattering radiative-transfer model to constrain spatial and temporal variations in the size distribution of atmospheric dust. The effective radius (reff) of dust observed by Spirit is found to be ~1.3–1.7 µm and by Opportunity ~1.4–1.8 µm (± ~0.1 µm). A positive correlation between reff and optical depth is observed. These data also provide new constraints on the effective variance (veff) of the size distribution of 0.4–0.5.
Refreshments will be served at 3:15 p.m. in the Atrium.
General
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