Z mode radiation in Jupiter's magnetosphere - The source of Jovian continuum radiation

Details Z mode radiation in Jupiter's magnetosphere - The source of Jovian continuum radiation Z mode radiation in Jupiter's magnetosphere - The source of Jovian continuum radiation

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.8187b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, June 1, 1990, p. 8187-8196.

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Continuous Radiation, Jupiter Atmosphere, Planetary Magnetospheres, Planetary Radiation, Gyrofrequency, Plasma Frequencies, Radiation Spectra, Voyager 1 Spacecraft, Jupiter, Radiation, Magnetosphere, Origin, Source, Voyager Missions, Spacecraft Observations, Spectra, Waves, Frequencies, Emissions, Theoretical Studies, Description, Resonance

Scientific paper

Observations of Z-mode waves in Jupiter's magnetosphere are analyzed. The assumption that the frequency of the intensity minimum, which isolates the signal, corresponds to the electron plasma frequency provides a consistent interpretation of all spectral features in terms of plasma resonances and cutoffs. It is shown that the continuum radiation is composed of both left-hand and right-hand polarized waves with distinct cutoffs observed at the plasma frequency and right-hand cutoff frequency, respectively. It is found that the Z-mode peak frequency lies close to the left-hand cutoff frequency, suggesting that the observed characteristics of the emission are the result of wave reflection at the cutoff layer. Another distinct emission occurring near the upper hybrid resonance frequency is detected simultaneously with the Z mode. The entire set of observations gives strong support to the linear mode theory of the conversion of upper hybrid waves to continuum radiation mediated by the Z mode via the Budden radio window mechanism.

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