On the characteristics of the basic framework of solar active regions and the magnetohydrodynamical structure of the convection zone |
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| Authors: | Hirokazu Yoshimura |
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| Institution: | (1) Dept. of Astronomy, University of Tokyo, Tokyo, Japan;(2) Present address: Advanced Study Program, National Center for Atmospheric Research, Boulder, Colo., U.S.A. |
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| Abstract: | The characteristics of the basic framework of structure and development of solar active regions are interpreted as good indicators of the magnetohydrodynamical structure of the convection zone, the magnetic field lines of which are twisted and are made wave-like by the action of the very large scale non-axisymmetric convection, called here the global convection. The characteristics discussed in this paper are: (i) the preponderance of preceding spots of bipolar sunspot groups in strength and life time relative to the following spots of the groups, (ii) the tilt of bipolar axes of the sunspot groups to the local parallels of latitude, (iii) the forward inclination of normal axes of sunspots inferred from the east-west asymmetry of the appearance and total area of sunspots, (iv) the faster rotation of sunspots than the averaged fluid rotation, and (v) the association of the characteristics of an active region with the presence of an older active region in its vicinity and with the relative disposition of the two active regions. |
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