Observations of Peculiarities of Sunspot Fragment Patterns |
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| Authors: | Nagovitsyna Elena Yu Nagovitsyn Yury A |
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| Institution: | (1) Central Astronomical Observatory at Pulkovo, Russian Academy of Sciences, St. Petersburg, Russia |
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| Abstract: | The subsurface space-dynamic structure of an active region is probed by coordinate tracking of 130 fragments of 19 sunspots during 6-hr observations in white light. Normalization and averaging of parameters for different active regions allow us to derive the distribution density, magnitude and sense of horizontal velocity of the fragments as functions of the distance from the center of preceding and following sunspots of a bipolar group. We first discover that on the interval from 0 to 3.3 sunspot radii the velocity field is similar in concept to the concentric convective complex (convective cell + ambient convective roll) wherein azimuthal dynamic components are in contradiction with the action of the Coriolis force. Thereupon we detect that the magnetic fragments on this interval tend to be clustered in the distinctive spiral patterns in which helical components are contradictory to the  -effect. Most likely we receive observational evidence of nonlinear transformation of the toroidal magnetic field into the familiar local-bipolar form through the following bifurcations in the supergranulation convection: self-oscillating horizontal magnetic field  pair of multi-armed spirals of concentration with opposite chirality (handedness) pair of concentric ring complexes of near-vertical magnetic field. |
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