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Earth, Planets and Space
Fig. 21 | Earth, Planets and Space

Fig. 21

From: An electric circuit model of the Earth’s polar electrojets and field-aligned currents for the estimation of magnetospheric magnetic field from along-track Swarm magnetic data

Fig. 21

The geometry considered to derive the magnetic field generated by Region 1 and Region 2 field-aligned currents connecting the northern polar ionosphere and the inner magnetosphere. The currents flow in the meridional plane \(\varphi =\alpha \). The poleward Region 1 and equatorward Region 2 have colatitudes \(\vartheta _{R_1}\) and \(\vartheta _{R_2}\), respectively. The electric circuit model designed in this paper considers also the second pair of Region 1 and Region 2 field-aligned currents connecting the southern polar ionosphere and the inner magnetosphere (not shown in the figure)

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