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Fig. 2


Geometry and nomenclature of Io and non-Io emissions, and corresponding arc shapes in the tf plane. Emission is produced along the displayed conical sheets, and thus observable only when the source is near a limb of Jupiter. Dawn side sources produce vertex-early arcs whereas dusk side sources produce vertex-late arcs, as explained in Hess et al. (2014). The magnetic field line connected to Io is sketched as the active, radio-emitting field line but actually the active field line leads the instantaneous Io field line by several degrees (cf. Fig. 1).

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