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  Rapid changes in the geomagnetic field: from global to regional scales

Mandea, M., Olsen, N., Korte, M., Verbanac, G., Yahiat, Y. (2008): Rapid changes in the geomagnetic field: from global to regional scales, (Eos, Transactions, American Geophysical Union, Suppl.; 89, 53), AGU 2008 Fall Meeting. (San Francisco, USA 2008).

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Datensatz-Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_238277 Versions-Permalink: -
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 Urheber:
Mandea, M.1, Autor
Olsen, N.1, Autor
Korte, Monika2, Autor              
Verbanac, G.1, Autor
Yahiat, Y.1, Autor
Affiliations:
1External Organizations, ou_persistent22              
22.3 Earth's Magnetic Field, 2.0 Physics of the Earth, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146030              

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Schlagwörter: Core processes; Satellite magnetics: main field, crustal field, external field; Time variations: secular and longer SC: Geomagnetism and Paleomagnetism; Abstract GP53A-0772
 DDC: 550 - Earth sciences
 Zusammenfassung: A large part of the Earth's magnetic field is generated by fluid motion in the molten outer core. Its temporal change, called secular variation, is characterized by occasional rapid changes known as geomagnetic jerks, sudden change in the second time derivative of the magnetic field. For a while, detailed studies of these phenomena suffered from the sparse distribution of geomagnetic observatories over many parts of the Earth. Recent studies on magnetic data provided by magnetic satellites, with a good global coverage, suggest that more rapid and smaller scale features than previously thought occur in the field change. Indeed, using nine years of magnetic field data obtained from CHAMP, Ørsted and SAC-C satellites as well as Earth-based observatories, the temporal changes in the core magnetic field and flow at the top of the core have been determined. Another approach has taken advantage of the high density of geomagnetic observatories in Europe to derive a regional model for detailed study of secular variation and acceleration over the past four decades. All known geomagnetic jerks are detected by this model; however, the time instant of a given jerk does not occur simultaneously in all magnetic field components. Both the regional and the global models indicate that secular variation and acceleration are very dynamic patterns suggesting short-term fluctuations and complex causal processes in the Earth's fluid core.

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 Datum: 2008
 Publikationsstatus: Final veröffentlicht
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 Identifikatoren: eDoc: 12692
GFZPOF: 1.0 Globale Prozesse und Geomonitoring
GFZPOF: PUF1023 Magnetic field diagnostics
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Titel: AGU 2008 Fall Meeting. (San Francisco, USA 2008)
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Titel: Eos, Transactions, American Geophysical Union, Suppl.; 89, 53
Genre der Quelle: Reihe
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