Fig. A.1
Black solid curve: variation of f (Eq. (A.12)) as a function of the planetary co-latitude of the polar-cap boundary α0. The top axis indicates the (non-linear) conversion from α0 to a normalised magnetospheric size following Eq. (A.1). Red dashed curve: the emission frequency at the polar-cap boundary (Eq. (A.3), right axis) for a magnetic field intensity at the pole of 14.3 G.
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