Visualization of motions at the Earth's core surface

Surface core flows are inverted directly from geomagnetic data, or from their interpollation through Gauss coefficients, using the radial induction equation at the core mantle boudary (CMB).
We provide here :

Streamfunctions at the CMB, superimposed with scalar fields
(e.g. radial magnetic field, flow norm... under several projections)
Earth's core surface (Aitoff projection)
Orthographic projection
Time-position maps of scalar fields (including geostrophic flow)
(with respect to longitude, latitude or curvilinear coordinates)
Cross-section of secular variation along Φ
Time series of surface core flow spherical harmonics coefficients
Time series of spherical harmonics coefficients
Comparison of core flow predictions observatories
(ground-based observatory series and virtual observatory series)
Comparison with observatories.
Mauersberger-Lowes spectra of the core quantities
for time-average, deviation or at a given date
Spectra of averaged core quantities
Three core flow models are provided and can be downloaded:

In addition, visualisation and download of two archeomagnetic models are provided:

Magnetic series are also compared with the CHAOS-6 field model [Finlay et al, 2016].

This project is supported by the French National Space Science Agency (CNES).