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Earth, Planets and Space
Fig. 19 | Earth, Planets and Space

Fig. 19

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. 19

The geometry considered to derive the magnetic field generated by a wire lying in the meridional plane \(\varphi =\alpha _{\mathrm{C}}\) and carrying the Pedersen current \(I_{\mathrm{PC}}\) in the auroral oval along a circular arc between points C and D at Region 1 and Region 2, respectively. The arc has radius \(r_{\mathrm{iono}}\) and extends between the geocentric colatitudes \(\vartheta _{R_1}\) and \(\vartheta _{R_2}\). The polar-cap Pedersen current \(I_{\mathrm{PPC}}\) flows across the polar cap to the opposite local-time sector. Crossed and dotted circles represent the flow of FACs into and out of the ionosphere, respectively

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