The height dependence of velocity-intensity fluctuations and several non-dimensional parameters in the solar photosphere

Details The height dependence of velocity-intensity fluctuations and several non-dimensional parameters in the solar photosphere The height dependence of velocity-intensity fluctuations and several non-dimensional parameters in the solar photosphere

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...252..812k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 252, no. 2, Dec. 1991, p. 812-820. Research supported by DFG.

Astronomy and Astrophysics

Astrophysics

29

Photosphere, Solar Atmosphere, Turbulent Mixing, Velocity Distribution, Autocorrelation, Height, Peclet Number, Reynolds Number, Solar Granulation, Solar Limb

Scientific paper

The quiet photosphere was studied using autocorrelation functions (ACFs) of intensity-velocity fluctuations. It is found that all ACFs get broader with height for the whole center-to-limb variation. For the length scale L, there is no significant center-to-limb variation but a general height dependence. In the lower photospheric layers (less than 150 km), L is of the order of 500 km, while in the higher layers L increases to 700 km. The vorticity is found to be 0.025/s in the lower photosphere and 0.001/s in the higher layers. The height dependence of several independent nondimensional parameters has been deduced to study the effect of dissipative processes on the granular motions. The Reynolds number is found to decrease from 5 x 10 exp 9 at the continuum layers to 10 exp 8 at the temperature minimum; the Peclet number decreases from 70 to 1; and the magnetic Reynolds number is of the order of 500,000. It is concluded that granules are buoyantly rising turbulent structures which disintegrate due to turbulent mixing with the environment.

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