On the dynamics of the large-scale magnetic fields of the sun and the sunspot cycle

Details On the dynamics of the large-scale magnetic fields of the sun and the sunspot cycle On the dynamics of the large-scale magnetic fields of the sun and the sunspot cycle

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...251..649m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 251, no. 2, Nov. 1991, p. 649-654.

Astronomy and Astrophysics

Astrophysics

22

Solar Activity, Solar Magnetic Field, Sunspot Cycle, Dynamo Theory, Magnetic Field Configurations, Polarity

Scientific paper

The purpose of the present article is to analyze the solar activity cycle from the point of view of large-scale magnetic fields (LSMFs), i.e., the 'polarity background' (unipolar magnetic regions) and the 'polar islands' (bipolar magnetic regions) with or without active regions. Using synoptic charts of the magnetic field (Stanford, McIntosh) and daily KPNO and Mount Wilson observations, a scenario has been developed that is based on the dynamics of the LSMFs. The activity cycle appears to be asymmetrical, with the north polar background predominating at the minimum and the south polar background at the maximum. The polarity islands in the background cover a large area and as they develop, they 'push' the magnetic field background toward the poles and thereby establish an equator-to-pole circulation at the solar surface. This circulation is also affected by the differential rotation of the sun. A fractal dimension analysis shows that the polarity islands become 'turbulent' as sunspot activity.

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