Effects of Absorption by Io on Composition of Energetic Heavy Ions

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Science  18 Oct 1996:
Vol. 274, Issue 5286, pp. 393-394
DOI: 10.1126/science.274.5286.393


The Galileo heavy ion counter is sensitive to ions with atomic numbers Z ≥ 6 and energies greater than ∼6 MeV per nucleon. During Galileo's passage through Jupiter's inner magnetosphere, the observed composition of these heavy ions was consistent with the presence of singly ionized iogenic O, Na, and S and highly ionized solar C, O, and Ne. The solar component is absorbed more strongly by Io because its gyroradius is smaller than Io's diameter.