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Detection of phase disturbances of free core nutation of the Earth and their concurrence with geomagnetic jerks

Earth, Planets and Space volume 57, pages 151–155 (2005)Cite this article

Abstract

We detected phase disturbances of the Free Core Nutation (FCN) of the Earth directly from the analysis of the Very Long Baseline Interferometer (VLBI) observation of the Earth rotation for the period 1984–2003 by applying the Weighted Wavelet Z-Transform (WWZ) method and the Short-time Periodogram with the Gabor function (SPG) method. During the period, the FCN had two significant phase disturbances in 1992 and 1998. These epochs coincide with the reported occurrence of geomagnetic jerks.

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Authors and Affiliations

  1. Goldman Sachs (Japan) Ltd., Minato-ku, Tokyo, 106-6147, Japan

    Toshimichi Shirai

  2. National Astronomical Observatory of Japan, Mitaka, Tokyo, 181-8588, Japan

    Toshio Fukushima

  3. Institute of Applied Astronomy of the Russian Academy of Sciences, St. Peterburg, 191187, Russia

    Zinovy Malkin

Authors
  1. Toshimichi Shirai
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  2. Toshio Fukushima
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  3. Zinovy Malkin
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Correspondence to Toshimichi Shirai.

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Shirai, T., Fukushima, T. & Malkin, Z. Detection of phase disturbances of free core nutation of the Earth and their concurrence with geomagnetic jerks. Earth Planet Sp 57, 151–155 (2005). https://doi.org/10.1186/BF03352559

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  • DOI: https://doi.org/10.1186/BF03352559

Key words

  • Free Core Nutation
  • reference frame
  • geomagnetic jerk