Wave activity in Europa's wake: Implications for ion pickup

Details Wave activity in Europa's wake: Implications for ion pickup Wave activity in Europa's wake: Implications for ion pickup

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jgr...10626033v&link_type=abstract

Journal of Geophysical Research, Volume 106, Issue A11, p. 26033-26048

Physics

Plasma Physics

12

Electromagnetics: Plasmas, Magnetospheric Physics: Plasma Waves And Instabilities, Planetology: Solar System Objects: Jovian Satellites, Space Plasma Physics: Charged Particle Motion And Acceleration

Scientific paper

Intense wave power at low frequencies (near and below the cyclotron frequencies of heavy ions) was present in Europa's wake during the E11 and E15 flybys. The fluctuations are mainly transverse to the background magnetic field, and wave characteristics indicate that they are ion cyclotron waves driven by positively charged pickup ions. In both flybys there is evidence, from the wave polarization, for pickup of negatively charged chlorine ions. The pickup rate inferred for the E15 flyby, when the moon is near the center of the Jovian current sheet, is larger than that for the E11 flyby, when the moon is outside the Jovian current sheet. The wave power does not provide absolute pickup density values, because the waves are observed in regions where their growth has not yet saturated. Low-frequency (

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