HR: 13:40h
AN: GP32A-01 INVITED     [PDF]
TI: Global Secular Variation from Satellite to Millennia Time Scales
AU: * Korte, M
EM: monika@gfz-potsdam.de
AF: GeoForschungsZentrum Potsdam, Telegrafenberg, Potsdam, 14473 Germany
AB: Secular variation can be studied on a large range of time scales from direct and indirect measurements of the geomagnetic field. Questions like minimum period and spatial scale of variations originating in the core are investigated with observatory and satellite data. Variations of external origin and mantle filtering are major impediments here. Indirect records of the geomagnetic field from archeo- and paleomagnetic studies provide time series long enough to investigate full periods of secular variation and the underlying core dynamics. While recently first continuous global models on the millennia scale have been developed, dating uncertainties in the individual time series and sparse data coverage challenge their reliability. Here an overview over secular variation features and their implications as determined from global models on decade to millennia time scales is given.
DE: 1507 Core processes (8115)
DE: 1532 Reference fields (regional, global)
DE: 1560 Time variations--secular and long term
SC: Geomagnetism and Paleomagnetism [GP]
MN: 2003 Fall Meeting