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Hydrocarbon photochemistry and Lyman alpha albedo of Jupiter

Yung, Yuk L. and Strobel, Darrell F. (1980) Hydrocarbon photochemistry and Lyman alpha albedo of Jupiter. Astrophysical Journal, 239 (1). pp. 395-402. ISSN 0004-637X. doi:10.1086/158120.

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A combined study of hydrocarbon and atomic hydrogen photochemistry is made to calculate self-consistently the Lɑ albedo of Jupiter. It is shown that the Lɑ emissions observed by Voyagers I and II can be explained by resonance scattering of sunlight. Precipitation-of energetic particles from the magnetosphere can provide the large required source of atomic hydrogen, although the contribution of direct particle excitation to the disk-averaged brightness is insignificant. The variability of the Lɑ brightness inferred from many observations in recent years is examined. The large difference in the brightness of the He 584 Å resonance line observed by Pioneer and Voyager is briefly discussed. Driving the photochemistry by solar ultraviolet radiation alone yields a maximum mixing ratio of C_2H_6 + C_2H_2 at 10^(-2) atm of about 4 x 10^(-6). The possibility of additional CH_4 dissociation from precipitation of magnetospheric particles is discussed. The photochemistry of C_2H_2 and C_2H_3 is sufficiently uncertain not to permit accurate calculations of their densities and the ratio C_2H_6/C_2H_2.

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Yung, Yuk L.0000-0002-4263-2562
Additional Information:© 1980 American Astronomical Society. Provided by the NASA Astrophysics Data System. Received 1979 December 6; accepted 1980 January 8. We thank A. L. Broadfoot and his team for providing us with preliminary data, G. R. Gladstone, and W. Huntress for helpful discussion. We thank the referee D. M. Hunten for improving our paper in many ways. This research was supported by NASA contract NSG-7376 to the California Institute of Technology under the Planetary Atmosphere Program.
Group:UNSPECIFIED, Division of Geological and Planetary Sciences
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Subject Keywords:molecular processes; planets: abundances; planets: Jupiter
Issue or Number:1
Record Number:CaltechAUTHORS:20140903-134806600
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Official Citation:Hydrocarbon photochemistry and Lyman alpha albedo of Jupiter Yung, Y. L.; Strobel, D. F. Astrophysical Journal, Part 1, vol. 239, July 1, 1980, p. 395-402. Publication Date: 07/1980
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49201
Deposited By: Ruth Sustaita
Deposited On:03 Sep 2014 23:48
Last Modified:10 Nov 2021 18:40

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