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| Titel |
On the ~80-year variation of the core surface geomagnetic field. Derivation and characteristics |
| VerfasserIn |
C. Stefan, V. Dobrica, C. Demetrescu |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250065757
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| Zusammenfassung |
| High-frequency ingredients, at time scales of 22 and ~80 years, present in observatory data and main field models, are also components of the radial field evolution at core surface. In this paper we focus on the ~80-year variation in the gufm1 model. Time-longitude plots covering a time span of about 320 years, at various latitudes between 60N and 60S, show a clear westward movement of the ~80-year features from the 30S-30N latitude band. The travelling speed of the latter is derived empirically and by means of spectral analysis. Time-latitude plots for several longitude bands indicate also a northward component of the movement of some features. |
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