Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1970
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970ap%26ss...7..183u&link_type=abstract
Astrophysics and Space Science, Volume 7, Issue 2, pp.183-200
Astronomy and Astrophysics
Astrophysics
44
Scientific paper
The motion of convective cells in an environment which changes rapidly with depth is examined. In such an environment a cell may move through regions with different levels of ionization and with associated differences in heat capacity. The energy equation is cast in a manner which is independent of the history of these cells. The convective flux at a given level of the atmosphere is written as an average over an ensemble of cells originating at a range of other levels. A procedure for correcting the temperature gradient for these non-local effects is described and results for a model solar atmosphere are given. The principal results are: (1) The rms velocity varies smoothly and is non-zero well into the photosphere (e.g.,v rsm=1.4 km/sec at τ=0.2); (2) Convective overshoot reduces the radiative flux to 60% and 90% of the total at τ=2.5 and 0.2 respectively; and (3) The interior adiabat of the convective envelope is less sensitive to the assumed value of the average cell size than in the usual treatment of convection.
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