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Fig. 3 | Earth, Planets and Space

Fig. 3

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

Fig. 3

Example fits of CHAOS-6 to secular variation recorded at ground observatories. Top Examples of relatively complete records, \({\text {d}}B_r/{\text {d}}t\) at Honolulu, USA (left), \({\text {d}}B_\theta /{\text {d}}t\) at Dourbes, Belgium (middle) and \({\text {d}}B_\phi /{\text {d}}t\) at Alice Springs, Australia (right); bottom zooms in to shorter records from recently established stations, \({\text {d}}B_r/{\text {d}}t\) at Gan, Maldives (left), \({\text {d}}B_\theta /{\text {d}}t\) at King Edward Point, South Georgia (middle), and \({\text {d}}B_\phi /{\text {d}}t\) at Tristan da Cunha (right). Black dots are annual differences of revised monthly means, and red lines are the SV predictions from CHAOS-6

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