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| Titel |
Periods of planetary waves in geomagnetic variations |
| VerfasserIn |
A. Kohsiek, K. H. Glassmeier, T. Hirooka |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 13, no. 2 ; Nr. 13, no. 2, S.168-176 |
| Datensatznummer |
250011746
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| Publikation (Nr.) |
 copernicus.org/angeo-13-168-1995.pdf |
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| Zusammenfassung |
| 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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