Pioneer 10 ultraviolet photometer observations at Jupiter encounter
1974; American Geophysical Union; Volume: 79; Issue: 25 Linguagem: Inglês
10.1029/ja079i025p03623
ISSN2156-2202
Autores Tópico(s)Astrophysics and Star Formation Studies
ResumoJournal of Geophysical Research (1896-1977)Volume 79, Issue 25 p. 3623-3633 Pioneer 10 ultraviolet photometer observations at Jupiter encounter R. W. Carlson, R. W. CarlsonSearch for more papers by this authorD. L. Judge, D. L. JudgeSearch for more papers by this author R. W. Carlson, R. W. CarlsonSearch for more papers by this authorD. L. Judge, D. L. JudgeSearch for more papers by this author First published: 1 September 1974 https://doi.org/10.1029/JA079i025p03623Citations: 102AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Abstract A two-channel extreme ultraviolet photometer on Pioneer 10 was used to investigate hydrogen and helium emissions from the atmosphere of Jupiter and emissions associated with the Galilean satellites. The hydrogen Lyman α signal observed from Jupiter corresponded to 400 R in brightness. By using the results of Wallace and Hunten, the eddy diffusion coefficient is found to be K = 3 × 108±1. The He I λ584-Å emission rate was found to be 5.1 R. The radiative transfer problem for the resonantly scattered He I emissions was investigated in the coherent approximation. With these results, the observed brightness, and the derived eddy diffusion coefficient the He/H2 ratio in the mixing region of the atmosphere was found to be [He]/[H2] = 0.18−0.12+0.46. Emissions attributed to H I Lyman α were found at the orbital radius of Io and appear to be due to resonance scattering by a toroidal cloud of H in orbit around Jupiter. 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