The GGF100k.avi animation illustrates global geomagnetic field evolution from 100 to 0 ka BP from the GGF100k spherical harmonic field model (Panovska et al., 2018). A compilation of field characteristics, discussed in the related publication, is shown. Animations LSMOD2.avi and IMOLE.avi show the same characteristics from previous and shorter models LSMOD.2 (50 – 30 ka, Korte et al., 2019) and IMOLEe (44 – 36 ka, Leonhardt et al., 2009). Due to the complexity of the animations they are best viewed step by step through time.
The panels from left to right are, in row 1: Maps of field intensity at Earth’s surface (F surf.), the dimensionless paleo-secular variation index Pi (Pi), radial field component (Br at the core-mantle boundary (CMB, with continents for reference purpose); row 2: maps of virtual dipole moment (VDM) at Earth’s surface and probability density of virtual geomagnetic pole (VGP prob. dens., on log pdf scale), and two polar views of Br at the CMB with the inner core tangent cylinder outlined in black;
row 3: time series of dipole latitude (Dip. Lat., blue, right ordinate) and dipole moment (DM, black, left ordinate) in top and of the three dipole spherical harmonic coefficients (g10, g11, h11) in the bottom panel, time series of globally averaged Pi with value given in the top left corner, and time series of dipole (D) and non-dipole (ND) power at the CMB in the bottom panel, and the geomagnetic power spectrum at the CMB (red dots) compared to the present-day (IGRF 12th generation) spectrum (grey dots). The age is given in the top right and indicated by red vertical bars on the time series in row 3.
References for the three models:
LSMOD.2: M. Korte, M. C. Brown, S. Panovska and I. Wardinski (2019), Robust characteristics of the Laschamp and Mono Lake geomagnetic excursions: results from global field models. Submitted to Frontiers in Earth Sciences.
IMOLE: R. Leonhard, K. Fabian, M. Winklhofer, A. Ferk, C. Laj and C. Kissel (2009), Geomagnetic field evolution during the Laschamp excursion, Earth Planet. Sci. Lett., 278, 87-95.
GGF100k: S. Panosvska, C. G. Constable and M. Korte (2018), Extending global continuous geomagnetic field reconstructions on timescales beyond human civilization, Geochem. Geophys. Geosyst., 19, doi:10.1029/2018GC007966.