Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...169..345z&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 169, no. 1-2, Nov. 1986, p. 345-354.
Astronomy and Astrophysics
Astrophysics
20
Jupiter (Planet), Planetary Radiation, Plasma Radiation, Radio Bursts, Radio Spectra, Decametric Waves, Io, Plasma Waves
Scientific paper
A model for Io phase dependent S-bursts in Jupiter's decametric radio emission is proposed. The source region is a multi-component system composed of an equilibrium plasma and an admixture of loss-cone ions and electrons. The system is localized in the Jovian ionosphere at the foot of the Io flux tube, in the region of a strong (ωB very large ωp) quasi-homogeneous magnetic field. Different types of conversion of plasma waves into electromagnetic waves lead to quasi-periodic trains of S-bursts and isolated simple S-bursts. The negative frequency drift is due to the group delay of extraordinary waves during their propagation in the region with low refractive index (ne very low 1). The strong beaming explains the Io phase dependent S-bursts. The central meridian longitude phase control is due to the fact that Io traverses periodically the region of increased plasma density (plasma torus) and that the number of particles reaching the source increases.
Shaposhnikov Vladimir E.
Zaitsev Valerii V.
Zlotnik Ia. E.
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