Physics
Scientific paper
Jul 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975moon...13..173s&link_type=abstract
(Lunar Science Institute, Symposium on Origin and Evolution of the Lunar Regolith, Houston, Tex., Nov. 13-15, 1974.) The Moon, v
Physics
3
Interplanetary Dust, Lunar Craters, Lunar Surface, Meteorite Craters, Angular Distribution, Explorer 35 Satellite, Impact Tests, Lunar Geology, Mass Transfer, Micrometeoroids, Volcanology
Scientific paper
Microcrater frequencies caused by fast (at least 3 km/sec) ejecta have been determined using secondary targets in impact experiments. The angular distribution of the secondary-crater number densities shows a primary maximum around 25 deg and a secondary maximum at about 60 deg from the primary target surface. The fraction of mass ejected at velocities of at least 3 km/sec is only a factor of 0.000075 of the primary projectile mass. A conservative calculation shows that the contribution of secondary microcraters (caused by fast ejecta) to primary microcrater densities on lunar rock surfaces (caused by interplanetary particles) is on the statistical average below 1% for any lunar surface orientation. Calculation of the interplanetary dust-flux enhancement caused by lunar ejecta is found to be in good agreement with Lunar Explorer 35 in situ measurements.
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