Voyager spacecraft radio observations of Jupiter - Initial cruise results

Details Voyager spacecraft radio observations of Jupiter - Initial cruise results Voyager spacecraft radio observations of Jupiter - Initial cruise results

Jun 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979georl...6..507k&link_type=abstract

Geophysical Research Letters, vol. 6, June 1979, p. 507-510.

Astronomy and Astrophysics

Astronomy

5

Jupiter (Planet), Long Wave Radiation, Planetary Radiation, Radio Astronomy, Radio Emission, Spaceborne Astronomy, Decametric Waves, Io, Planetary Rotation, Polarized Electromagnetic Radiation, Voyager Project, Jupiter, Emissions, Wavelengths, Radioemissions, Polarization, Radio Astronomy, Io, Satellites, Voyager 1, Voyager 2, Models, Decameter Waves, Hectometer Waves

Scientific paper

Low frequency (below 1326 kHz) observations of Jupiter obtained from November, 1977 through June, 1978 by the radio astronomy receivers carried by the two Voyager spacecraft are reported and compared with a large body of higher-frequency ground-based observations. Although the morphology of hectometric wavelength (HOM) emissions strongly resembles that of decametric (DAM) wavelength radio noise, they display opposite polarization. DAM emissions are strongly modulated by Io, whereas HOM emissions exhibit little or no influence from any satellite and appear to be modulated by the rotation phase of the planet. Several single-source models could possibly account for these results, including a model assuming emission at two well-separated frequencies above and below the local electron plasma frequency and the model proposed by Barbosa (1976) in which electrostatic waves at twice the upper hybrid frequency couple to both the ordinary and extraordinary electromagnetic modes. However, neither of these is entirely satisfactory.

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