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Earth, Planets and Space
Fig. 20 | Earth, Planets and Space

Fig. 20

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. 20

The geometry considered to derive the magnetic field generated by a wire lying in \(x=x_0\) plane and carrying the polar-cap Pedersen current \(I_{\mathrm{PPC}}\) along a circular arc between points C and \(C'\). The left and right panels show the projections onto the \(z=z_0\) and \(x=x_0\) planes, respectively, where \(z_0=r_{\mathrm{iono}}\cos \vartheta _{R_1}\), \(a_C=r_{\mathrm{iono}}\sin \vartheta _{R_1}\) (see Fig. 19) and \(x_0=a_C\sin \alpha _C\). Large crossed and dotted circles represent the flow of FACs into and out of the ionosphere, respectively

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