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Earth, Planets and Space
Fig. 11 | Earth, Planets and Space

Fig. 11

From: Magnetometer data from the GRACE satellite duo

Fig. 11

Top: time evolution of \(q_1^0(t)\) describing the strength of the symmetric ring-current as determined separately from magnetic observations of six satellites. Bottom: time evolution of spherical harmonic expansion coefficients up to degree \(N=2\) by joint analysis of data from these 6 satellites

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