Physics – Geophysics
Scientific paper
Jul 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3714307j&link_type=abstract
Geophysical Research Letters, Volume 37, Issue 14, CiteID L14307
Physics
Geophysics
1
Geomagnetism And Paleomagnetism: Time Variations: Diurnal To Decadal, Magnetospheric Physics: Mhd Waves And Instabilities (2149, 6050, 7836), Mathematical Geophysics: Time Series Analysis (1872, 1988, 4277, 4475)
Scientific paper
The effects of core fluid dynamics are observable as variations in the geomagnetic field at time scales of decades to many thousands of years. A non-classical method, Empirical Mode Decomposition (EMD) is performed on globally distributed observatory records of declination and inclination to study decadal variations of the geomagnetic field. We use waveform analysis to test the robustness of EMD and find an 11.5 year signal consistent with the solar cycle. Periods of 30.5, 62 and 81 years are also identified in the observations and compared with results from core flow inversions. These signals are likely to be of internal origin, potentially the manifestation of torsional oscillations, in the fluid core. Finally, we analyse a new 600 year time series from Munich and suggest that a longer, 160 year period exists.
Jackson Philip L.
Mound Jon E.
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