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Fig. 9 | Earth, Planets and Space

Fig. 9

From: Polynomial modelling of CHAMP satellite data to investigate rapid secular variation fluctuations over southern Africa during 2003 and 2004

Fig. 9

The plots of the first time derivative of 3 components (dX/dt, dY/dt, and dZ/dt) at the selected points for years 2001–2005. The indicated epochs of rapid SV fluctuations are associated with an error of ±0.3 year. The monthly mean values were generated using the monthly main field data from polynomial modelling of satellite data at 400 km altitude.

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