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Fig. 1.
Schematic illustration of the geometry used to define fluxes ΦB and Φj. S, which is the surface of a polar cap with a radius r and the opening angle θ, is shown by the red shaded area. Fluxes are defined as ΦB ≡ ∫SB ⋅ ndS and Φj ≡ ∫Sj ⋅ ndS.
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