Fig. 2.

Examples of the geometry involved in the modelling of the Io-controlled emissions of Jupiter. The emission depends on the relative position of Io, Jupiter, and the observer, in particular on the jovigraphic longitude of the observer (λCML, i.e. the central meridian longitude) and that of the active field line which can differ from that of Io (λIo) by a lead angle (δλ).
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