Sounder stimulated Dn resonances in Jupiter's Io plasma torus

Details Sounder stimulated Dn resonances in Jupiter's Io plasma torus Sounder stimulated Dn resonances in Jupiter's Io plasma torus

Oct 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9818751o&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. E10, p. 18,751-18,756

Computer Science

Sound

9

Io, Jupiter (Planet), Plasma Interactions, Plasma Resonance, Satellite Sounding, Toruses, Electron Density (Concentration), Gyrofrequency, Magnetic Fields, Ulysses Mission, Voyager Project

Scientific paper

On February 8, 1992, the Ulysses spacecraft passed through Jupiter's Io plasma torus, where rich spectra of narrow-band resonances were stimulated by the relaxation sounder of the Ulysses unified radio and plasma wave (URAP) instrument. Since the gyrofrequency fg is comparable to the plasma frequency fp in the Io torus, it was predicted that the general classification of stimulated ionospheric Dn resonances, developed for 1 is less than or equal to fp/fg is less than or equal to 8 in the Earth's topside ionosphere, should apply in the Io torus as well as the Earth's magnetosphere (Osherovich, 1989). The URAP plasmagrams (sounder spectra) in the portions of the Io torus satisfying these plasma conditions are dominated by the Dn resonances for frequencies below fp. On most of these plasmagrams the fp resonance is also present, but it is seldom the dominant resonance. Neither upper hybrid nor nfg resonances have been found on these plasmagrams. The identification of Dn resonances has allowed both the electron density and the magnetic field amplitude to be calculated. The derived densities on the outbound pass agree well with a Voyager model of Bagenal (1992). The derived magnetic field values are close to the Goddard Space Flight Center O6 magnetic field model.

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