The moon and the planets

, Volume 25, Issue 4, pp 373–387 | Cite as

Interaction of S- and L-bursts in Jupiter's decametric radio spectra

  • Jorma J. Riihimaa
  • Thomas D. Carr


Dynamic spectra of Jupiter's decametric emission are observed with a high-resolution radio spectrograph. Certain events observed in region Io-B display interaction effects between the S- and L-emissions. The effect appears as a gap in the L-emission after a passage of an S-burst. In a typical case the L-emission has a relatively narrow bandwidth, the S-burst appears as a sloping line crossing it, and the duration of the emission gap is a substantial fraction of a second. The gap has sharp, sloped edges; its leading edge has anf-t slope which is the same as that of the S-burst while the slope of the trailing edge is lower. A kind of ‘tilted V-pattern’ is thus formed. It is suggested that some more complicated spectral patterns may also be produced this way. It seems that an emission model consisting of S-bursts from bunches of gyrofrequency-emitting electrons ascending a flux tube and interacting with L-emitting bunches of electrons having more stationary guiding centers is inadequate to explain the complex S-L interactions.


Interaction Effect Typical Case Flux Tube Substantial Fraction Leading Edge 
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Copyright information

© D. Reidel Publishing Co. 1981

Authors and Affiliations

  • Jorma J. Riihimaa
    • 1
    • 2
  • Thomas D. Carr
    • 1
  1. 1.Department of AstronomyUniversity of FloridaGainesvilleUSA
  2. 2.Aarne Karjalainen ObservatoryUniversity of OuluFinland

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