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The time varying geomagnetic field of Southern Africa

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Figure

Fig. 1.A map showing the various field survey stations (indicated by �) for southern Africa as well as the 3 continuous recording observatories atHermanus, Hartebeesthoek and Tsumeb (indicated by �).
Fig. 2. A plot showing the secular variation in declination (D) as observed at Hermanus, Hartebeesthoek and Tsumeb.
Fig. 3. A plot showing the declination secular variation over southern Africa as modelled by Spherical Cap Harmonic Analysis for various time intervalsbetween 1975 and 2000

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