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Earth, Planets and Space
Fig. 18 | Earth, Planets and Space

Fig. 18

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. 18

The geometry considered to derive the magnetic field generated by a wire lying in \(y=y_0\) plane and carrying the polar-cap Hall current \(I_{\mathrm{PHC}}\) along a circular arc between points A and \(A'\). The left and right panels show the projections onto the \(z=z_0\) and \(y=y_0\) planes, respectively, where \(z_0=r_{\mathrm{iono}}\cos \vartheta _A\), \(a_A=r_{\mathrm{iono}}\sin \vartheta _A\) (see Fig. 17) and \(y_0=a_A\cos \alpha _A\)

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