Fig. 10From: Polynomial modelling of CHAMP satellite data to investigate rapid secular variation fluctuations over southern Africa during 2003 and 2004The plots of the first time derivative of 3 components (dX/dt, dY/dt, and dZ/dt) at 2 permanent ground-based observatories (HER and TSU) foryears 2001–2005. The indicated epochs of rapid SV fluctuations are associated with an error of ±0.1 year.Back to article page