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Solar activity and the variations of the geomagnetic Kp-index

I: Photospheric activity

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Abstract

A careful correlation analysis is made between various types of solar activity as observed at photospheric levels and the daily variations of the geomagnetic Kp-index which, in turn, is a measure of the solar wind speed. We find that in no case does a significant enough correlation exist to pin-point a physical relation between some aspect of photospheric activity and the solar wind speed. It is concluded that the physical processes that do determine the wind speed occur at coronal heights.

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Authors and Affiliations

  1. Joint Institute for Laboratory Astrophysics and Dept. of Physics and Astrophysics, University of Colorado, 80302, Boulder, Colo., U.S.A.

    John T. Mariska & Ludwig Oster

Authors
  1. John T. Mariska
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  2. Ludwig Oster
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Mariska, J.T., Oster, L. Solar activity and the variations of the geomagnetic Kp-index. Sol Phys 26, 241–249 (1972). https://doi.org/10.1007/BF00155123

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  • DOI: https://doi.org/10.1007/BF00155123

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