Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978icar...36..133g&link_type=abstract
Icarus, vol. 36, Oct. 1978, p. 133-146.
Astronomy and Astrophysics
Astronomy
Astronomical Photography, Atmospheric Diffusion, Mars Atmosphere, Photointerpretation, Spaceborne Photography, Turbulent Diffusion, Atmospheric Boundary Layer, Craters, Deposition, Diffusivity, Dust Storms, Image Contrast, Mars Surface, Pattern Recognition, Turbulence Effects, Diffusion, Mars, Mariner 9, Streaks, Martian, Surface, Craters, Wind, Crater Streaks, Morphology, Atmosphere, Boundary Layers, Turbulence
Scientific paper
The frequency distributions of the spreading half-angles of light and dark Martian streaks, observed in selected Marina 9 images, are determined, and the eddy diffusivity is calculated by assuming that a secondary maximum spreading angle (approximately 14 deg) found in a few dark streaks, represents atmospheric diffusion and subsequent deposition of material from isolated sources such as vents or blowouts. A described diffusion-deposition analysis is used to deduce the eddy diffusivity in Mars' boundary layer; values are between 10 to the seventh power and 10 to the ninth power and exhibit the proper scale dependence. Smaller spreading angle values are thought to represent crater-wake spreading phenomena.
Gifford F. A.
Hosker R. P.
Rao Srinivasa K.
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