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Earth, Planets and Space
Fig. 2 | Earth, Planets and Space

Fig. 2

From: The 2014 geomagnetic jerk as observed by southern African magnetic observatories

Fig. 2

Secular variation of the X component at HER, HBK, KMH and TSU observatories as derived from monthly mean measurements between 2006 and 2015. The black dots show monthly mean secular variation estimates used as running annual differences. Both the CHAOS-6 and POMME 10 global field models are included for comparative purposes. Piecewise linear fits to the data provide estimates of secular acceleration as given in the legends

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