SP-345 Evolution of the Solar
System
FIGURE 18.8.1.- The smoothed
(M,
a)
diagram of fig. 4 3.4. Mass distribution in units of grams per radial
distance interval of 
a =0.01 AU. To emphasize the significance of the log
scale, high-density regions are darkened. In analogy with fig.
18.6.4, the diagram, diminished by a factor 2/3 and turned upside
down, is shown in the upper part of the diagram demonstrating the
"hetegonic shadow" effect which produces the inner cutoff of the
asteroidal belt. Similarly Jupiter's shadow, which generates the
outer cutoff, is shown, as well as the position of Jupiter. Kirkwood
gaps from Jovian resonances are also marked. (From Alfvén et
al, 1974.)
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