Venus mesosphere and thermosphere : II. Global circulation, temperature, and density variations
dc.contributor.author | Bougher, Stephen | en_US |
dc.contributor.author | Dickinson, R. E. | en_US |
dc.contributor.author | Ridley, E. C. | en_US |
dc.contributor.author | Roble, Raymond Gerald | en_US |
dc.contributor.author | Nagy, Andrew F. | en_US |
dc.contributor.author | Cravens, Tom E. | en_US |
dc.date.accessioned | 2006-04-07T19:24:40Z | |
dc.date.available | 2006-04-07T19:24:40Z | |
dc.date.issued | 1986-11 | en_US |
dc.identifier.citation | Bougher, S. W., Dickinson, R. E., Ridley, E. C., Roble, R. G., Nagy, A. F., Cravens, T. E. (1986/11)."Venus mesosphere and thermosphere : II. Global circulation, temperature, and density variations." Icarus 68(2): 284-312. <http://hdl.handle.net/2027.42/25994> | en_US |
dc.identifier.uri | http://www.sciencedirect.com/science/article/B6WGF-47313NK-10T/2/21dabba82a0b42ade92565d67ebdb6bb | en_US |
dc.identifier.uri | https://hdl.handle.net/2027.42/25994 | |
dc.description.abstract | Recent Pioneer Venus observations have prompted a return to comprehensive hydrodynamical modeling of the thermosphere of Venus. Our approach has been to reexamine the circulation and structure of the thermosphere using the framework of the [Dickinson and Ridley, 1977], symmetric two-dimensional model. Sensitivity tests were conducted to see how large-scale winds, eddy diffusion and conduction, and strong 15-[mu]m cooling affect day-night contrasts of densities and temperatures. The calculated densities and temperatures are compared to symmetric empirical model fields constructed from the Pioneer Venus data base. We find that the observed day-to-night variation of composition and temperatures can be derived largely by a wave-drag parameterization that gives a circulation system weaker than predicted prior to Pioneer Venus. The calculated mesospheric winds are consistent with Earth-based observations near 115 km. Our studies also suggest that eddy diffusion is only a minor contributor to the maintenance of observed day and nightside densities, and that eddy coefficients are smaller than values used by previous one-dimensional composition models. The mixing that occurs in the Venus thermosphere results from small-scale and large-scale motions. Strong CO2 15-[mu]m cooling buffers solar perturbation such that the response by the general circulation to solar cycle variation is relatively weak. | en_US |
dc.format.extent | 2244602 bytes | |
dc.format.extent | 3118 bytes | |
dc.format.mimetype | application/pdf | |
dc.format.mimetype | text/plain | |
dc.language.iso | en_US | |
dc.publisher | Elsevier | en_US |
dc.title | Venus mesosphere and thermosphere : II. Global circulation, temperature, and density variations | en_US |
dc.type | Article | en_US |
dc.rights.robots | IndexNoFollow | en_US |
dc.subject.hlbsecondlevel | Astronomy | en_US |
dc.subject.hlbtoplevel | Science | en_US |
dc.description.peerreviewed | Peer Reviewed | en_US |
dc.contributor.affiliationum | Space Physics Research Laboratory, 2455 Hayward, University of Michigan, Ann Arbor, Michigan 48109, USA | en_US |
dc.contributor.affiliationum | Space Physics Research Laboratory, 2455 Hayward, University of Michigan, Ann Arbor, Michigan 48109, USA | en_US |
dc.contributor.affiliationother | Advanced Study Program, National Center for Atmospheric Research,, 1 P.O. Box 3000, Boulder, Colorado, 80307, USA: High Altitude Observatory, National Center for Atmospheric Research,1 P.O. Box 3000, Boulder, Colorado, 80307, USA | en_US |
dc.contributor.affiliationother | Atmospheric Analysis and Prediction, National Center for Atmospheric Research,, 1 P.O. Box 3000, Boulder, Colorado, 80307, USA | en_US |
dc.contributor.affiliationother | Scientific Computing Division, National Center for Atmospheric Research,, 1 P.O. Box 3000, Boulder, Colorado 80307, USA | en_US |
dc.contributor.affiliationother | High Altitude Observatory, National Center for Atmospheric Research,1 P.O. Box 3000, Boulder, Colorado, 80307, USA | en_US |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/25994/1/0000060.pdf | en_US |
dc.identifier.doi | http://dx.doi.org/10.1016/0019-1035(86)90025-4 | en_US |
dc.identifier.source | Icarus | en_US |
dc.owningcollname | Interdisciplinary and Peer-Reviewed |
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