R. E. Johnson et al 2006 ApJ 644 L137 doi:10.1086/505750
R. E. Johnson1, H. T. Smith1, O. J. Tucker1, M. Liu1, M. H. Burger2, E. C. Sittler2 and R. L. Tokar3
Show affiliationsThe remarkable observation that Enceladus, a small icy satellite of Saturn, is actively venting has led to the suggestion that ejected water molecules are the source of the toroidal atmosphere observed at Saturn for over a decade using the Hubble Space Telescope (HST). Here we show that the venting leads directly to a new feature, a narrow Enceladus neutral torus. The larger torus, observed using HST, is populated by charge exchange, the process that limits the lifetime of the neutrals in the Enceladus torus.
Issue 2 (2006 June 20)
Received 2006 April 10, accepted for publication 2006 May 12
Published 2006 June 14
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