Solar and stellar activity - The theoretical approach

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Astrophysics, Solar Activity, Stellar Activity, Dynamo Theory, Electrodynamics, Heat Flux, Late Stars, Periodic Variations, Stellar Magnetic Fields, Stellar Models

Scientific paper

The unified approach to understanding solar and stellar activity is examined. Stellar activity observations have stimulated theoretical work, mostly within the framework of the alpha-omega dynamo theory. A number of uncertainties and intrinsic limits in dynamo theory do still exist, and these are discussed together with alternative or complementary suggestions. The relevance is stressed of nonlinear problems in dynamo theory - magnetoconvection, growth and stability of flux tubes against magnetic buoyancy, hydromagnetic global dynamos - to improve the understanding of both small and large scale interaction of rotation, turbulent convection and magnetic fields, and the transition from the linear to the nonlinear regime. Recent dynamo models of stellar activity are critically reviewed regarding the dependence of activity indexes and cycles on rotation rate and spectral type. Open problems to be solved by future work are outlined.

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