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Solar Physics

, Volume 56, Issue 2, pp 449–461 | Cite as

A solar cycle variation of the interplanetary magnetic field

  • G. L. Siscoe
  • N. U. Crooker
  • L. Christopher
Article

Abstract

Measurements of the north-south (B z component of the interplanetary field as compiled by King (1975) when organized into yearly histograms of the values of ¦B z ¦ reveal the following. (1) The histograms decrease exponentially from a maximum occurrence frequency at the value ¦B z ¦ = 0. (2) The slope of the exponential on a semi-log plot varies systematically roughly in phase with the sunspot number in such a way that the probability of large values of ¦B z ¦ is much greater in the years near sunspot maximum than in the years near sunspot minimum. (3) There is a sparsely populated high-value tail, for which the data are too meager to discern any solar cycle variation. The high-value tail is perhaps associated with travelling interplanetary disturbances. (4) The solar cycle variations of B z and the ordinary indicators of solar activity are roughly correlated. (5) The solar cycle variation of B z is distinctly different than that of the solar wind speed and that of the geomagnetic Ap disturbance index.

Keywords

Magnetic Field Wind Speed Solar Wind Solar Activity Solar Cycle 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© D. Reidel Publishing Company 1978

Authors and Affiliations

  • G. L. Siscoe
    • 1
  • N. U. Crooker
    • 1
  • L. Christopher
    • 1
  1. 1.Dept. of Atmospheric SciencesLos AngelesUSA

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