Modulation lanes in the dynamic spectra of Jupiter's decametric radio emission

High-resolution dynamic spectra of Jupiter's decametric emission exhibit lane patterns, referred to as modulation lanes. These lanes appear tilted in the orthogonal time-frequency plane, and the sign and magnitude of their drift rate is determined by the central meridian longitude of System III at Jupiter. The lanes are recorded both on L- and S-bursts, giving rise to only a relatively few basic spectral types. Their simultaneous appearance, however, produces rather complicated spectral events. The origin of the modulation lanes is unknown. A few possible mechanisms are suggested.