Computer Science
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010em%26p..107..147c&link_type=abstract
Earth, Moon, and Planets, Volume 107, Issue 2-4, pp. 147-155
Computer Science
Grain Accretion, Weak Discharge, Electrostatic Mechanism, Solar System Formation, Protoplanetary Nebula
Scientific paper
Work presented here addresses the issue of grain accretion, an essential yet poorly understood process in planetary system formation, linking the dynamically modeled steps of temperature-dependent condensation of gases after proto-sun gravitational collapse to coalescence of kilometer-size planetesimals into planets. The mechanism for grain accretion has proven difficult to model dynamically. Here, we attempt to test the thesis that the accretion process is electrostatically-driven by non-uniform charging of grains in a low discharge/weak field environment equivalent to periodic conditions in protoplanetary nebulae during solar discharge events such as flares. We simulate in the laboratory the behavior of grains in relationship to surfaces in such an environment. The nature of the observed disaggregation, repulsion, and acceleration of grains away from initial surfaces, and their reaggregation as coatings on surrounding oppositely charged surfaces, provide an empirical experimental basis for an electrostatically-driven model for grain behavior and accretion. Similar weak discharge processes in the protoplanetary disk solar nebula could give rise to increased grain acceleration and collisional compression induced surface coating, necessary conditions for increased accretion. The frequency, timing, and level of energetic output of the proto-sun would influence the effectiveness of such processes in developing stable aggregates, and the nature of the solar system that would result.
Calle Carlos I.
Clark Pamela E.
Curtis Steven Andrew
Marshall Jonathan R.
Minetto F. A.
No associations
LandOfFree
Observed Weak Electron Beam Discharge Driven Grain Acceleration/Accretion with Implications for Planet Formation does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Observed Weak Electron Beam Discharge Driven Grain Acceleration/Accretion with Implications for Planet Formation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Observed Weak Electron Beam Discharge Driven Grain Acceleration/Accretion with Implications for Planet Formation will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1813495