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Fluid transport on earth and aeolian transport on MarsExperimental data on cohesion-free particle transport in fluid beds are applied, via a universal scaling relation, to atmospheric transport of fine grains on Mars. It may be that cohesion due to impact vitrification, vacuum sintering, and adsorbed thin films of water are absent on Mars - in which case the curve of threshold velocity versus grain size may show no turnup to small particle size, and one micron diameter grains may be injected directly by saltation into the Martian atmosphere more readily than 100 micron diameter grains. Curves for threshold and terminal velocities are presented for the full range of Martian pressures and temperatures. Suspension of fine grains is significantly easier at low temperatures and high pressures; late afternoon brightenings of many areas of Mars, and the generation of dust storms in such deep basins as Hellas, may be due to this effect.
Document ID
19760031415
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Sagan, C.
(Cornell University Ithaca, N.Y., United States)
Bagnold, R. A.
(Rickwoods, Mark Beech, Edenbridge Kent, United Kingdom)
Date Acquired
August 8, 2013
Publication Date
October 1, 1975
Publication Information
Publication: Icarus
Volume: 26
Subject Category
Lunar And Planetary Exploration
Accession Number
76A14381
Funding Number(s)
CONTRACT_GRANT: NGR-33-010-220
Distribution Limits
Public
Copyright
Other

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