Detection of phase disturbances of free core nutation of the Earth and their concurrence with geomagnetic jerksReport as inadecuate




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Earth, Planets and Space

, Volume 57, Issue 2, pp 151–155

First Online: 21 June 2014Received: 27 July 2004Revised: 17 January 2005Accepted: 29 January 2005

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.

Key wordsFree Core Nutation reference frame geomagnetic jerk  Download to read the full article text



Author: Toshimichi Shirai - Toshio Fukushima - Zinovy Malkin

Source: https://link.springer.com/







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