Theoretical comparison of plasma and magnetic feature tracking (MFT) flows: a perspective for assimilating meridional flow data in flux-transport models

Details Theoretical comparison of plasma and magnetic feature tracking (MFT) flows: a perspective for assimilating meridional flow data in flux-transport models Theoretical comparison of plasma and magnetic feature tracking (MFT) flows: a perspective for assimilating meridional flow data in flux-transport models

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh54a..03g&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SH54A-03

Astronomy and Astrophysics

Astrophysics

[7544] Solar Physics, Astrophysics, And Astronomy / Stellar Interiors And Dynamo Theory

Scientific paper

Doppler measurements of the poleward flow speed at the solar surface reveal a systematic difference from the speed inferred from magnetic feature-tracking (MFT). In order to understand the reason for this difference we simulate the MFT speed using advective-diffusive transport models in both one and two dimensions. By depositing magnetic bipolar regions at different latitudes at the Sun's surface and following their evolution for a prescribed meridional circulation and magnetic diffusivity profiles, we derive the MFT speed as a function of latitude. We find that in a one dimensional surface-transport model the simulated MFT speed at the surface is always the same as the meridional flow-speed used as input to the model, but is different in a two-dimensional transport model in the meridional (r,θ) plane. The difference depends on the value of the magnetic diffusivity and on the radial gradient of the latitudinal velocity. We have confirmed our results with two different codes in spherical and Cartesian coordinates. The possibility of assimilate time-varying meridional flow data in flux-transport dynamo models is also discussed.

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