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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 13, issue 2
Ann. Geophys., 13, 168-176, 1995
https://doi.org/10.1007/s00585-995-0168-y
© European Geosciences Union 1995
Ann. Geophys., 13, 168-176, 1995
https://doi.org/10.1007/s00585-995-0168-y
© European Geosciences Union 1995

  28 Feb 1995

28 Feb 1995

Periods of planetary waves in geomagnetic variations

A. Kohsiek, K. H. Glassmeier, and T. Hirooka A. Kohsiek et al.

Abstract. Periods of planetary waves, especially the 10- and 16-day waves, were found in Fourier analyses of 10-year geomagnetic time series from two mid-latitude stations in the northern hemisphere. This suggests that planetary waves influence geomagnetic variations. Cross-spectral analysis of magnetic time series from seven stations located at around 50°N at the beginning of 1979, when a 16-day wave occurred in the stratosphere, also shows a 16-day oscillation. However, study of the phases does not reveal the horizontal direction of wave propagation. Furthermore, the temporal variations of the 16-day oscillation in magnetic time series are presented as dynamic spectra and the results are compared with global investigations of geopotential height data at 1 hPa (around 48 km) with respect to the 16-day wave for the same time interval. In some cases this comparison suggests a clear correlation between geomagnetic variations and planetary waves as well as a propagation of the 16-day wave up to the dynamo region (100-170 km).

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