Problems do not in general appear alone. There is also a second old problem: what is the origin of the heating of the solar corona. Where does the energy needed for the heating come from?
TGD proposal is based on a model, which emerged initially as a model for "cold fusion" (not really) in terms of dark nucleosynthesis, which produced dark scaled up variants of ordinary nuclei as dark proton sequences with much smaller binding energy. This can happen even in living matter: Pollack effect involving irradiation by IR light of water bounded by gel phase creates negatively charged regions from which part of protons go somewhere. They could go to magnetic flux tubes and form dark nuclei. This could explain the reported transmutations in living matter not taken seriously by academic nuclear physicists.
TGD proposal is that the protons transform to dark proton sequences at magnetic flux tubes with nonstandard value of Planck constant heff/h0=n. Dark nuclei with scaled up size. Dark nuclei can transform to ordinary nuclei by heff→ h (h= 6h0 is the most plausible option) and liberate almost all nuclear binding energy in the process. The outcome would be "cold fusion".
This leads to a vision about pre-stellar evolution. First came the dark nucleosynthesis, which heated the system and eventually led to a temperature at which the ordinary nuclear fusion started. This process could occur also outside stellar cores - say in planet interiors - and a considerable part of nuclei could be created outside star.
A good candidate for the site of dark nucleosynthesis would be solar corona. Dark nucleosynthesis could heat the corona and create metals also here. They would absorb the radiation coming from the solar core and reduce the measured effective metallicity to 1.3 per cent.
For a summary of earlier postings see Latest progress in TGD.