Proc. Neutrino Astrophysics - MPP Theory Group

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Figure 2: The difference between U as predicted by selected solar models, Umod, and the
helioseismic determination, U⊙, normalized to this latter (thin line). The allowed area is that
within the thick lines. BP95 is the model with metal and He diffusion of Ref. [12]; JCD96 is
the“model S” of Ref. [20]; D96 is the “model 0” of Ref. [21]; CDR97 is the “best” model with
He and heavier elements diffusion of Ref. [17].
Figure 3: Helioseismic determinations and solar model predictions of properties of the convective
envelope. The box defines the region allowed by helioseismology. Open circles denote
models without diffusion, squares models with He diffusion, full circles models with He and
heavier elements diffusion [4].