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On the limitations of geomagnetic measures of interplanetary magnetic polarity

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Abstract

The maximum attainable accuracy in inferring the interplanetary magnetic polarity from polar cap magnetograms is about 88 %. This is achieved in practice, when high latitude polar cap stations are used during local summer-months, and the signature in the ground records is strong. An attempt by Svalgaard (1972) to use this effect to infer an index of interplanetary magnetic polarity back to 1926 has not been so successful. Furthermore, some of the properties of the index have changed with time. Prior to 1963, the inferred polarities are strongly dependent on geomagnetic activity, while after this time they are not. Thus, this index should not be used to separate solar-magnetic from solar-activity effects prior to 1963.

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Authors and Affiliations

  1. Institute of Geophysics and Planetary Physics, University of California, 90024, Los Angeles, Calif., U.S.A.

    C. T. Russell & R. L. Rosenberg

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  1. C. T. Russell
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  2. R. L. Rosenberg
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Russell, C.T., Rosenberg, R.L. On the limitations of geomagnetic measures of interplanetary magnetic polarity. Sol Phys 37, 251–256 (1974). https://doi.org/10.1007/BF00157861

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  • DOI: https://doi.org/10.1007/BF00157861

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