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Fig. 4 | Earth, Planets and Space

Fig. 4

From: Toward more complete magnetic gradiometry with the Swarm mission

Fig. 4

Variances \(\tilde{\sigma }_{(1)}^2\) (a) and \(\tilde{\sigma }_{(2)}^2\) (b) computed from the approximated kernel matrices \({\mathbf {G}^{(1)}}\) resp. \({\mathbf {G}^{(2)}}\). Variance \(\tilde{\sigma }_{(0)}^2\) (c) computed from the theoretical kernel matrix \({\mathbf {G}^{(0)}}\). The variances are calculated based on Swarm Alpha and Charlie positions between April 2014 and March 2016

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