Io plasma torus and the source of Jovian narrow-band kilometric radiation

Details Io plasma torus and the source of Jovian narrow-band kilometric radiation Io plasma torus and the source of Jovian narrow-band kilometric radiation

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987natur.327..492j&link_type=abstract

Nature (ISSN 0028-0836), vol. 327, June 11, 1987, p. 492-495.

Physics

16

Io, Jupiter (Planet), Kilometric Waves, Planetary Radiation, Space Plasmas, Toruses, Electrostatic Waves, Planetary Magnetic Fields, Plasma Density, Polarization (Waves), Spectrograms, Voyager 1 Spacecraft, Jupiter, Satellites, Plasma Torus, Source, Kilometer Waves, Emissions, Radiation, Io, Spacecraft Observations, Voyager Missions, Intensity, Frequencies, Wavelengths, Latitude, Polarization, Magnetic Fields, Rotation, Source, Origin, Electrostatics, Electromagnetic Effects, Spectra, Optical Properties, Mo

Scientific paper

Narrow-band jovian kilometric radiation (nKOM) is distinguishable from broad-band jovian kilometric radiation (bKOM), both discovered by the Voyager spacecraft, by its generally lower intensity, its more restricted range of centre frequency, its narrower bandwidth, and its temporally less sporadic nature. It was proposed that bKOM is produced within ≡2° of the magnetic equator in the outer Io plasma torus by conversion of electrostatic upper hybrid waves to ordinary electromagnetic radiation via a radio window. Here the author shows that nKOM seems to be produced by the same conversion process, also operating in the Io torus, but at latitudes ≥8°. The difference in latitude for nKOM and bKOM sources stems from the condition required for mode conversion that the plasma density gradient should be normal to the magnetic field vector.

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