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• W2067894999 abstract "It is proposed that the transport of material from Io to the plasma torus requires the presence of an atmosphere as an intermediate buffer. Direct escape of volcanic SO 2 is expected to be negligible. The sputtering of surface SO 2 frost by corotating ions (if they reach the surface) or by magnetospheric MeV ions would not provide sufficient escape flux. Instead, such sputtering process produces an ∼97% fraction with energy less than the escape energy; hence this process alone could produce an atmosphere thick enough to prevent the corotating ions from reaching the surface and thick enough to disallow even the energetic sputtered products created at the surface to escape. The escape from an atmosphere could take place by several mechanisms, of which secondary sputtering at the exobase is dominant. The escape rate from a thin atmosphere increases with increasing atmospheric SO 2 content. By preparing photochemical models of SO 2 atmospheres for varying total atmospheric pressure and calculating the escape rates, it is concluded that the globally averaged atmospheric SO 2 pressure on Io at Voyager 1 encounter must have been ≳ 1.4×10 −10 bar (surface density n 0 (SO 2 ) ≳ 1.2×10 10 cm −3 , or column density of ≳ 1×10 16 cm −2 ), as the escape rates in this limiting case are just adequate to populate the torus if the Brown et al. (1983) estimates of the supply rate are applicable. However, if the higher estimates of Pontius and Hill (1983) are appropriate, then more SO 2 would be needed in the Io atmosphere." @default.
• W2067894999 created "2016-06-24" @default.
• W2067894999 creator A5060878234 @default.
• W2067894999 date "1984-09-01" @default.
• W2067894999 modified "2023-10-08" @default.
• W2067894999 title "Sulfur and oxygen escape from Io and a lower limit to atmospheric SO₂ at Voyager 1 encounter" @default.
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• W2067894999 doi "https://doi.org/10.1029/ja089ia09p07399" @default.
• W2067894999 hasPublicationYear "1984" @default.
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