Direct evidence for solar wind control of Jupiter's hectometer-wavelength radio emission

Astronomy and Astrophysics – Astronomy

Scientific paper

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Jupiter (Planet), Planetary Radiation, Radio Astronomy, Solar Planetary Interactions, Solar Wind, Autocorrelation, Cross Correlation, Decametric Waves, Io, Plasma Density, Radio Spectra, Voyager 1 Spacecraft, Voyager 2 Spacecraft, Jupiter, Solar Wind, Hectometer Waves, Radio Waves, Emissions, Pra, Wavelengths, Voyager 1, Voyager 2, Observations, Plasmas, Density, Periodicity, Source, Origin, Earth-Based Observations, Comparisons, Magnetic Properties, Structure, Planetary Radio Astronomy Experiment

Scientific paper

Observations of the solar wind close to Jupiter by the Voyager 1 and Voyager 2 spacecraft in 1978 and 1979 are compared with the hectometer-wavelength radio emission from the planet. A significant positive correlation is found between variations in the solar wind plasma density at Jupiter and the level of Jovian radio emission output. During the 173-day interval studied for the Voyager 2 data the radio emission displayed a long-term periodicity of about 13 days, identical to that shown by the solar wind density at Jupiter and consistent with the magnetic sector structure association already proposed for ground-based observations of the decameter-wavelength emission.

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