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The interannual modulation of the solar and geomagnetic activity relationships

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Abstract:

The interannual modulation of the geomagnetic activity caused by solar activity is investigated by means of the mutual spectral analysis. The frequency characteristics of connection between the Wolf numbers W0 and the aa index of geomagnetic activity for the time interval 1890-1990 are analysed. Interannual and seasonal variations in the corresponding coherence spectra CH(T) for the quasi-decennial, quasi-pentennial, quasi-triennial and quasi-biennial cycles are revealed. The particular properties of the mean parameters for individual months are outlined.

Keywords: Geomagnetic Activity; Solar activity; Solar terrestrial relationship

Document Type: Research Article

DOI: http://dx.doi.org/10.1080/10556790410001654088

Affiliations: 1: Sternberg Astronomical Institute Universitetskij Prospekt Moscow 119992 Russia 2: Fedorov Institute of Applied Geophysics Moscow 129128 Russia

Publication date: April 1, 2004

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