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Record 1 of 3073
Nonlinear anelastic modal theory for solar convection
Author and Affiliation:
Latour, J.(Joint Institute for Laboratory Astrophysics, Boulder, CO, Nice, Observatoire)
Toomre, J.(Colorado, University)
Zahn, J.-P.(Pic-du-Midi et Toulouse, Observatoires, Bagneres-de-Bigorre, Hautes-Pyrenees, France)
Abstract: Solar envelope models are developed using single-mode anelastic equations as a description of turbulent convection which provide estimates for the variation with depth of the largest convective cellular flows, with horizontal sizes comparable to the total depth of the convection zone. These models can be used to describe compressible motions occurring over many density scale heights. Single-mode anelastic solutions are obtained for a solar envelope whose mean stratification is nearly adiabatic over most of its vertical extent because of the enthalpy flux explicitly carried by the big cell, while a subgrid scale representation of turbulent heat transport is incorporated into the treatment near the surface. It is shown that the single-mode equations allow two solutions for the same horizontal wavelength which are distinguished by the sense of the vertical velocity at the center of the three-dimensional cell. It is found that the upward directed flow experiences large pressure effects which can modify the density fluctuations so that the sense of the buoyancy force is changed, with buoyancy braking actually achieved near the top of the convection zone. It is suggested that such dynamical processes may explain why the amplitudes of flows related to the largest scales of convection are so weak in the solar atmosphere.
Publication Date: Jan 01, 1983
Document ID:
19830046440
(Acquired Nov 30, 1995)
Accession Number: 83A27658
Subject Category: SOLAR PHYSICS
Document Type: Journal Article
Publisher Information: Netherlands
Contract/Grant/Task Num: F19628-77-C-0104; NSF ATM-80-20426; NSG-7511; NAGW-91
Financial Sponsor: NASA; United States
Organization Source: Joint Inst. for Lab. Astrophysics; Boulder, CO, United States
Colorado Univ.; Boulder, CO, United States
Observatoire du Mont-Gros; Nice, France
Description: 14p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: CONVECTIVE FLOW; NONLINEAR EQUATIONS; SOLAR ATMOSPHERE; STELLAR ENVELOPES; STELLAR MODELS; TURBULENT FLOW; ADIABATIC FLOW; ANELASTICITY; ATMOSPHERIC STRATIFICATION; BOUNDARY VALUE PROBLEMS; COMPRESSIBLE FLUIDS; DENSITY DISTRIBUTION; ENERGY TRANSFER; ENTHALPY; PRESSURE EFFECTS; TURBULENT HEAT TRANSFER
Imprint And Other Notes: (International Astronomical Union and Akademiia Nauk SSSR, Colloquium on Problems of Solar and Stellar Oscillations, 66th, Nauchny, Ukrainian SSR, Sept. 1-5, 1981.) Solar Physics, vol. 82, Jan. 1983, p. 387-400.
Availability Source: Other Sources
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