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


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.


Magnetic Field Wind Speed Solar Wind Solar Activity Solar Cycle 
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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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