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Fig. 3. | Earth, Planets and Space

Fig. 3.

From: Determining field-aligned currents with the Swarm constellation mission

Fig. 3.

Top: Route elements d1,3 along-track are constant, whereas the cross-track ones, d2,4 are smallest close to the geographic poles (the crossings are located at indices 1400 (near North Pole), 4150 (near South Pole), 6900 (near North Pole)); bottom: variation of angles α and β along the same orbit (descending arc (1400–4150) — ascending arc (4151–6900)).

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