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Paper: Longitudinal Structure Originated in the Tachocline Zone of the Sun
Volume: 383, Subsurface and Atmospheric Influences on Solar Activity
Page: 381
Authors: Gavryuseva, E.
Abstract: Longitudinal structure of the photospheric magnetic field over the last three cycles of solar activity (21, 22, and 23) has been studied. The differential rotation rate Ω of the magnetic field of the Sun was found as a function of latitude and time. The presence of torsional waves is clearly presented. An interesting effect of the relatively fast rotation of the photospheric field on the latitudes higher than 55° is discussed, and a possible explanation is suggested.

The reconstruction of the magnetic field longitudinal structure was performed in different coordinate systems; rotating rigidly, and like the photosphere. A longitudinal structure, exceptionally regular in both hemispheres and symmetric, has been found without any a priori assumption about the rotation of the Sun. This structure is originated in the tachocline zone under the convective envelope. A comparison between the rotational rate of the large scale magnetic field and helioseismological findings of as a function of latitude and radius Ω was performed and it was concluded that the rotation rate at the base of the convective envelope at a latitude of about 55° coincides with the rotation rate where the longitudinal structure is generated.

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