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| Titel |
Latitude dependency of the geomagnetic secular variation S parameter: A mathematical artifact |
| VerfasserIn |
J. Linder, S. A. Gilder |
| 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 |
250063242
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| Zusammenfassung |
| Secular variation, the change in the Earth’s magnetic field through time, reflects the energy
state of the geodynamo. Secular variation is commonly quantified by paleomagnetists as the
standard deviation of the angular distances of the virtual geomagnetic poles to their mean
pole, known as the S value. This parameter has long been thought to exhibit latitude
dependence [S(λ)], whose origin is widely attributed to a combination of time-varying dipole
and non-dipole components. The slope and magnitude of S(λ) are taken as a basis to
understand the geomagnetic field and its evolution. Here we show that S(λ) stems
from a mathematical aberration of the conversion from directions to poles, hence
directional populations better quantify local estimates of paleosecular variation. |
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