Helicity and alpha-effect of simple convection cells

Details Helicity and alpha-effect of simple convection cells Helicity and alpha-effect of simple convection cells

Feb 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...118..363s&link_type=abstract

Astronomy and Astrophysics, vol. 118, no. 2, Feb. 1983, p. 363, 364.

Astronomy and Astrophysics

Astrophysics

5

Convection Currents, Electrodynamics, Helical Flow, Solar Corona, Solar Rotation, Density Distribution

Scientific paper

The helicity of a rotationally distorted convection cell in a fluid with spatially varying density was derived in order to calculate the mean electric current parallel to the mean field of the sun (the alpha-effect). The alpha-effect occurs in a conducting fluid subjected to helical motions. A representative convection cell is analyzed in terms of eight harmonic contributions to the helicity of the rotational motion. The estimate derived for the alpha term is dependent on the rotation and density stratification, as was found by Krause (1967).

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