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Fig. 9 | Earth, Planets and Space

Fig. 9

From: Morphology of the southern African geomagnetic field derived from observatory and repeat station survey observations: 2005–2014

Fig. 9

Secular variation of D, H, and Z components at Tsumeb observatory as a function of time between 2005 and 2014. The black dots show monthly mean secular variation estimates derived as running annual differences. The CHAOS-5 (black line) and SAREG (brown dashed line) models are included. Piecewise linear fits to the data provide estimates of secular acceleration as given in the legends

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