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On the structure of field-aligned currents in the mid-altitude cusp

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Fig. 1. Models of the magnetic perturbation created by a pair of opposite parallel infinite current sheets (left) and a circular current tube (right)
Fig. 2. Cluster data for event A (sc-1, 29 August 2002). (a) CIS ion spectrogram in the direction parallel to the magnetic field; (b), (c) PEACE electron spectrogram in the parallel and anti-parallel directions; (d) electron and ion field-aligned currents;
Fig. 3. Cluster data for event B (sc-4, 10 September 2002). Same format as Fig. 2.
Fig. 4. Hodograph of the perpendicular component of the magnetic perturbation for the period 14:06–14:13 UT during event B (sc-4, 10 September 2002)
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