Physics
Scientific paper
Jan 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3402113c&link_type=abstract
Geophysical Research Letters, Volume 34, Issue 2, CiteID L02113
Physics
7
Interplanetary Physics: Pickup Ions, Ionosphere: Plasma Waves And Instabilities (2772), Planetary Sciences: Solar System Objects: Jovian Satellites, Planetary Sciences: Solar System Objects: Io, Planetary Sciences: Solar System Objects: Comets (6023)
Scientific paper
Ion pickup in planetary environments results in unstable newborn ion populations with sufficient free energy to generate electromagnetic plasma waves. Estimates of the SO2 + pickup rates near the Jovian moon, Io, based on ion cyclotron wave observations assumed that the newborn pickup ions lose 50% of their energy to wave growth. Using one-dimensional initial-value hybrid simulation, we test this assumption and predict that at most ~25% of the energy of the newborn ion population is lost to wave growth for conditions at Io. This energy is lost over >1400 SO2 + gyroperiods (~1 hour), with the majority lost after saturation of the instability. Thus the saturation wave energy is low, at <3% of the newborn ion population's energy. In contrast, newborn ions in cometary environments saturate at substantially higher wave energies (~30% of the newborn ion population's energy), but do not continue to lose energy afterwards.
Cowee Misa M.
Russell Christopher T.
Strangeway Robert J.
Winske Dan
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