The internal magnetic field of the sun

Astronomy and Astrophysics – Astronomy

Scientific paper

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Magnetic Flux, Solar Interior, Solar Magnetic Field, Convective Heat Transfer, Radiative Heat Transfer, Stellar Envelopes, Stellar Models, Time Dependence

Scientific paper

An attempt is made to place limits on the size of moderate- to large-scale components of magnetic field in the radiative interior of the Sun. Two approaches are employed: (1) Inferred limits on the magnitude of the radial and transverse components of any such field at the base of the convective envelope are used to constrain the initial and current internal field structure via a self-consistent time-dependent solution of the magnetohydrodynamic and thermal equations for the solar interior. (2) The thermomagnetic circulation induced by field inhomogeneities of somewhat smaller scale is calculated self-consistently and, following Parker (1985), limits on 7Li depletion at the solar surface are employed to give limits on the field strength in the radiative interior. The results of both calculations suggest that interior field strengths much in excess of 105G are unlikely.

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