Except for the neutrinos, there is no direct observational means to study the Sun’s interior. Theoretical considerations must therefore be made. These consist partly of rigorous physical laws, such as the conservation of energy or mass, and partly of plausible assumptions, concerning, e.g., the chemical composition, or the effect of magnetic and centrifugal forces. Sometimes the physics is known in principle, but it is very complicated to work out all the details, and uncertainties remain; examples are the opacity of the solar gas, or the equation of State.
KeywordsSolar Neutrino Hydrostatic Equilibrium Solar Model Neutrino Flux Solar Interior
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