Fractal nature of the solar magnetism and dualism of the dynamo process
The magnetic field is a key agent of the solar and stellar activity. Processes of magnetic field generation, emergence and dispersal over the solar surface determine solar activity on all scales. A new circle along the dialectic spiral has been made in our understanding of the dynamo process: from the classical Babcock-Leighton model that explains the global dynamo and 22-year solar cycle, to the acceptance of the small-scale local turbulent dynamo, which might operate inside the near-surface layer and be responsible for generation of the small-scale magnetic fields forming a “magnetic carpet”. And yet, this scenario of simultaneous action of two dynamos seems to be oversimplified when fractal properties of the photospheric plasma became detected. Such properties allow us to take a new look at the solar and stellar magnetism: to interpret the dynamo as a single nonlinear dynamical dissipative process with intrinsic properties of self-organization, order on large and chaos on small scales, capability to spontaneous transition into a critical state and burst-like energy release. The concept closes the dialectic spiral and offers new ways to model and understand the solar and stellar dynamo.
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