The Sun’s Rotation Rate as Inferred from Magnetic Field Data

  • J. O. Stenflo
Conference paper
Part of the International Astronomical Union book series (IAUS, volume 138)


The pattern of solar magnetic fields has been used as a tracer to determine how the sun’s rotation rate varies with latitude and time. Two distinctly different rotation laws emerge from such an analysis, one agreeing with the surface Doppler rotation rate, the other corresponding to much more rigid rotation with a small polar spin-up. Detailed analysis shows that this second law cannot be explained in terms of flux redistribution on the solar surface, but that it represents the rotation properties of the sources of magnetic flux, which are likely to be located at the bottom of the convection zone.

The rotational phase velocity of the source pattern is found to be constant with time, which suggests that the depth at which the magnetic flux is stored and amplified inside the sun does not vary with the solar cycle, and that the phaae velocity also represents the plasma velocity.


Magnetic Flux Solar Cycle Rotation Rate Rotation Period Convection Zone 
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Copyright information

© International Astronomical Union 1990

Authors and Affiliations

  • J. O. Stenflo
    • 1
  1. 1.Institute of AstronomyZürichSwitzerland

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