Abstract
Abstract : The polarity of the interplanetary magnetic field has been inferred by Svalgaard from observations of the polar geomagnetic field during the interval 1926-1971. On the basis of a few years of spacecraft observations Rosenberg and Coleman have suggested that there may be an annual variation in the predominant polarity of the interplanetary field. The present analysis of 45 years of inferred field polarity shows clearly an annual variation and also a variation of about twenty years, which may be associated with the solar magnetic cycle. The annual variation changes its predominant polarity within a few days of the times when the heliographic latitude of the earth is zero. (Author)
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