edu.ucar.opensky::articles:10741 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-26T04:04:49.300078 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d7gm87vt Plasma flow versus magnetic feature-tracking speeds in the Sun 2012-02-01T00:00:00Z publication https://n2t.org/ark:/85065/d7gm87vt https://doi.org/10.1111/j.1745-3933.2011.01167.x Guerrero, G. author Rheinhardt, M. author Dikpati, Mausumi author UCAR/NCAR - Library publisher We simulate the magnetic feature tracking (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,theta) 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. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication Copyright 2012 Authors. Published under license by John Wiley & Sons for the Royal Meteorological Society. The definitive version is available at http://onlinelibrary.wiley.com. None eng geoscientificInformation