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Earth, Planets and Space
Fig. 10 | Earth, Planets and Space

Fig. 10

From: Recent geomagnetic secular variation from Swarm and ground observatories as estimated in the CHAOS-6 geomagnetic field model

Fig. 10

Top Power spectra of the vector field secular acceleration at the core surface  for various times up to degree 16. Red colours indicate times of SA pulses; blue colours indicate times when SA is minimum. Black and grey colours are times approaching the model endpoints, where SA at high degree is strongly influenced by the imposed model end constraints. Bottom Quadratic norm of the SA power versus time for different truncation levels, \(n=6\) (black), \(n=9\) (blue), \(n=12\) (green), and \(n=15\) (red)

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