Europa's effect on Jupiter's Radio Emission: A Galileo Study

Astronomy and Astrophysics – Astronomy

Scientific paper

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6954 Radio Astronomy, 7534 Radio Emissions, 2732 Magnetosphere Interactions With Satellites And Rings

Scientific paper

Jupiter ground-based and space-based decameter wavelength emissions (DAM) have a well-known correlation with the orbital phase of Io. Menietti et al. (1998; 2001) showed that the Galileo spacecraft high frequency receiver data show correlations with the orbital phase of Ganymede and Callisto. Using Galileo data we perform a study of the influence of Europa using a unique occurrence probability data compilation technique that includes rotation period averaging and removal of Io influence. In addition, we removed the known effects of Ganymede and Callisto from our results. We find a small but significant correlation between the 2.0 - 5.6 MHz band of the DAM emission and the orbital phase of Europa. A statistical significance test was computed to compare sample populations for the largest peak of occurrence probability with the background. We find significance values much greater than the 99% confidence level (statistical Z-test > 5σ) for a Europa phase interval of 260 - 290 degrees. These analyses give further evidence for Alfvenic interactions between the Europa and Jupiter, and may provide spatial constraints on some of the radio emission source locations.

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