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Record Details

Record 18 of 2436
Ortho-para-hydrogen equilibration on Jupiter
External Online Source: doi:10.1086/171510
Author and Affiliation:
Carlson, Barbara E.(NASA Goddard Inst. for Space Studies, New York, NY, United States)
Lacis, Andrew A.(NASA Goddard Inst. for Space Studies, New York, NY, United States)
Rossow, William B.(NASA Goddard Institute for Space Studies, New York, United States)
Abstract: Voyager IRIS observations reveal that the Jovian para-hydrogen fraction is not in thermodynamic equilibrium near the NH3 cloud top, implying that a vertical gradient exists between the high-temperature equilibrium value of 0.25 at depth and the cloud top values. The height-dependent para-hydrogen profile is obtained using an anisotropic multiple-scattering radiative transfer model. A vertical correlation is found to exist between the location of the para-hydrogen gradient and the NH3 cloud, strongly suggesting that paramagnetic conversion on NH3 cloud particle surfaces is the dominant equilibration mechanism. Below the NH3 cloud layer, the para fraction is constant with depth and equal to the high-temperature equilibrium value of 0.25. The degree of cloud-top equilibration appears to depend on the optical depth of the NH3 cloud layer. Belt-zone variations in the para-hydrogen profile seem to be due to differences in the strength of the vertical mixing.
Publication Date: Jul 01, 1992
Document ID:
19920061206
(Acquired Nov 22, 1995)
Accession Number: 92A43830
Subject Category: LUNAR AND PLANETARY EXPLORATION
Document Type: Journal Article
Publication Information: Astrophysical Journal, Part 1 (ISSN 0004-637X); 393; 1, Ju; 357-372
Publisher Information: United States
Organization Source: NASA Goddard Inst. for Space Studies; New York, NY, United States
NASA; Washington, DC, United States
Description: 16p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: IRIS SATELLITES; JUPITER ATMOSPHERE; ORTHO HYDROGEN; PARA HYDROGEN; THERMODYNAMIC EQUILIBRIUM; VOYAGER PROJECT; AMMONIA; INFRARED INTERFEROMETERS; JUPITER (PLANET); RADIATIVE TRANSFER
Imprint And Other Notes: Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 393, no. 1, July 1, 1992, p. 357-372. Research supported by NASA.
Miscellaneous Notes: Research supported by NA
Availability Source: Other Sources
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