Observations of electron gyroharmonic waves and the structure of the Io torus

Details Observations of electron gyroharmonic waves and the structure of the Io torus Observations of electron gyroharmonic waves and the structure of the Io torus

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.8497b&link_type=abstract

Journal of Geophysical Research, vol. 86, Sept. 30, 1981, p. 8497-8507. Research supported by the Centre National d'Etudes Spat

Astronomy and Astrophysics

Astronomy

63

Harmonic Radiation, Io, Planetary Radiation, Plasma Spectra, Satellite Atmospheres, Space Plasmas, Electron Density (Concentration), Electron Plasma, Time Response, Toroidal Plasmas, Voyager Project, Jupiter, Satellites, Io, Plasma Torus, Structure, Waves, Observations, Electrons, Harmonics, Data, Voyager 1, Radial Distance, Density, Pra, Planetary Radio Astronomy Experiment, Spectrum, Comparisons, Emissions, Theoretical Studies, Frequencies, Distribution, Models, Temperatures, Analysis, Spectroscopy, Ultra

Scientific paper

Narrow-banded emissions observed by the planetary radio astronomy experiment on the Voyager 1 spacecraft as it traversed the Io plasma torus are discussed. It is found that the waves occur between harmonics of the electron gyrofrequency; they are Jovian analogue of electrostatic emissions observed and theoretically studied for the terrestrial magnetosphere. It is noted that the observed frequencies always include the component near the upper hybrid resonant frequency but that the distribution of the other observed emissions varies in a systematic way with position in the torus. A detailed discussion of the observations is given. Also included is a refined model of the electron density variation, based on identification of the upper hybrid resonant frequency line.

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