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[19.05] Can Simulations of Active Region Magnetic Fields Lead to a Simplified Model of Turbulent Pumping?

W.P. Abbett, G.H. Fisher (Space Sciences Laboratory, UC Berkeley), Y. Fan (High Altitude Observatory, NCAR), D.J. Bercik (Space Sciences Laboratory, UC Berkeley)

We present a series of 3-D MHD simulations in the anelastic approximation of active region scale magnetic flux ropes embedded in a highly stratified, turbulent model convection zone. The numerical calculations are carried out over long time scales (of order a solar rotation time) at high magnetic Reynolds numbers and suggest that the process of ``turbulent pumping'' --- the tendency for magnetic flux to be efficiently transported from surface layers to the base of the convection zone --- does not manifest itself in the absence of a convective overshoot layer. If the overshoot layer is present, we suggest a simple, statistical model (similar to a 1-D, depth-dependent eddy-diffusivity treatment with a characteristic time-scale of supergranulation) that describes the average properties of the flux storage process.

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Bulletin of the American Astronomical Society, 35 #3
© 2003. The American Astronomical Soceity.