Physics
Scientific paper
Nov 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apg..book....1h&link_type=abstract
In NASA. Washington Advan. in Planetary Geol. p 1-218 (SEE N82-17010 07-91)
Physics
1
Asteroids, Breccia, Meteorites, Regolith, Stochastic Processes, Algorithms, Average, Irradiation, Monte Carlo Method, Random Walk, Solar System, Statistical Analysis
Scientific paper
A model is constructed which views regolith evolution on asteroids as a stochastic process. Average values are shown to be poor descriptors of regolith depth. The utility of the average depth is not significantly increased by avoiding large craters or thick ejecta deposits, a procedure adopted in previous regolith studies. The statistical uncertainty associated with regolith depth severely limits the power of regolith models in predicting parent-body size for brecciated meteorites. A Monte Carlo algorithm was used to simulate the random walks and corresponding charged-particle irradiation histories of grains in regoliths. On rocky asteroids, only about 20 percent of the grains was exposed to solar cosmic ray ions. Results based on present-day conditions in the asteroid belt agree well with irradiation features observed in gas-rich meteorites. An origin during epochs of early solar system evolution is not required.
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