Record Details

Particles, environments and possible ecologies in the Jovian atmosphere
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Author and Affiliation:
Sagan, C.(Cornell Univ., Ithaca, NY, United States);
Salpeter, E. E.(Cornell Univ., Ithaca, NY, United States)
Abstract: The eddy diffusion coefficient is estimated as a function of altitude, separately for the Jovian troposphere and mesosphere. Complex organic molecules produced by the Ly alpha photolysis of methane may possibly be the absorbers in the lower mesosphere which account for the low reflectivity of Jupiter in the near ultraviolet. The optical frequency chromophores are localized at or just below the Jovian tropopause. Candidate chromophore molecules must satisfy the condition that they are produced sufficiently rapidly that convective pyrolysis maintains the observed chromophore optical depth. The condition is satisfied if complex organic chromophores are produced with high quantum yield by NH3 photolysis at less than 2,300 A. Jovian photoautotrophs in the upper troposphere satisfy this condition well, even with fast circulation, assuming only biochemical properties of comparable terrestrial organisms. An organism in the form of a thin, gas filled balloon can grow fast enough to replicate if (1) it can survive at the low mesospheric temperatures, or if (2) photosynthesis occurs in the troposphere.
Publication Date: May 01, 1976
Document ID:
19760019038
(Acquired Nov 18, 1995)
Accession Number: 76N26126
Subject Category: LUNAR AND PLANETARY EXPLORATION
Report/Patent Number: NASA-CR-148170, CRSR-617-REV
Document Type: Technical Report
Publisher Information: United States
Contract/Grant/Task Num: NGR-33-010-101; NGR-33-010-082
Financial Sponsor: NASA; United States
Organization Source: Cornell Univ.; Center for Radiophysics and Space Research.; Ithaca, NY, United States
Description: 70p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: ATMOSPHERIC MODELS; ECOLOGY; JUPITER ATMOSPHERE; PARTICLES; ATMOSPHERIC CHEMISTRY; ATMOSPHERIC COMPOSITION; CHROMOPHORES; SUPERPLASTIC FORMING; SUPERPLASTIC FORMING; TURBULENT DIFFUSION
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