Periods of planetary waves in geomagnetic variations |
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| Authors: | A Kohsiek K H Glassmeier T Hirooka |
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| Institution: | (1) Institut für Geophysik und Meteorologie, Technische Universität Braunschweig, D-38106 Braunschweig, Germany;(2) Department of Earth and Planetary Science, Faculty of Science, Kyushu University, Fukuoka J-812, Japan |
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| 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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