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Solar activity and recurrences in magnetic-field distribution

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Abstract

A study of the Mount Wilson magnetic-field synoptic chart material divided into latitude zones for the interval 1959–67, and a comparison of the data with sunspot groups have provided a better understanding of the structure of the background-field pattern and its relation to activity. The interaction of old and new fields within the pattern seems to result in long-lived sections of alternating polarity in both hemispheres. We postulate subsurface sources with rotation periods of about 27 days which produce active regions over a longitude zone of some tens of degrees. There is a tendency for the background-field features with strong fields to resist to some extent the shearing effects of differential rotation. A prediction is made concerning the nature of the interplanetary magnetic field above the ecliptic.

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Authors and Affiliations

  1. Astronomical Institute of the Czechoslovak Academy of Sciences, Ondřejov

    V. Bumba & R. Howard

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  1. V. Bumba
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  2. R. Howard
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On leave from the Mount Wilson and Palomar Observatories, Carnegie Institution of Washington, California Institute of Technology, Pasadena, Calif., U.S.A.

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Bumba, V., Howard, R. Solar activity and recurrences in magnetic-field distribution. Sol Phys 7, 28–38 (1969). https://doi.org/10.1007/BF00148402

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  • DOI: https://doi.org/10.1007/BF00148402

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