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| Titel |
Inferring interannual fluctuations of the core angular momentum from geomagnetic field models |
| VerfasserIn |
Seiki Asari, Ingo Wardinski |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250147132
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| Publikation (Nr.) |
 EGU/EGU2017-11243.pdf |
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| Zusammenfassung |
| Satellite models for Earth’s core magnetic field, as well as observations of Earth rotation
variation, suggest an existence of interannual core dynamics. Due to its small magnetic
signal, however, interannual variations in the core flow and accompanying core angular
momentum (CAM) are still subject to a large ambiguity, particularly when inferred from
pre-satellite magnetic models. It is nevertheless indicated from our systematic flow inversions
with a core field model C3FM2 that estimated phases of interannual CAM variations are
almost insensitive to prior settings of the inversion. We discuss that the uncertainty of Earth’s
interannual CAM fluctuations arises from, besides the theoretical lack of resolution,
differences of core field models in the interannual secular accelerations. C3FM2 may be
optimized for better resolving the interannual CAM fluctuations by properly regulating its
temporal smoothness. |
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