SP-345 Evolution of the Solar
System
FIGURE 12.6.1. Schematic
representation of the accretion of an embryo from a jet stream.
Plasma emplacement and infall of grains to the jet stream occurs
during the time tinf. The accreting
embryo at first acquires mass slowly hut then reaches catastrophic
accretion at time tc when all mass
present m the jet stream is accreted by the embryo. For me case
tinf >
tc, a slow rate of
accretion continues after the runaway accretion occurs. The slow
accretion continues until plasma emplacement has ceased. For the case
tinf <
tc, as illustrated
in the lower graph, after emplacement ceases and contraction of the
jet-stream volume by negative diffusion increases the density in the
jet stream, accretion commences and culminates in catastrophic
accretion.
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