2010
DOI: 10.1088/0004-637x/725/1/1082
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The Advection of Supergranules by the Sun's Axisymmetric Flows

Abstract: We show that the motions of supergranules are consistent with a model in which they are simply advected by the axisymmetric flows in the Sun's surface shear layer. We produce a 10day series of simulated Doppler images at a 15-minute cadence that reproduces most spatial and temporal characteristics seen in the SOHO/MDI Doppler data. Our simulated data have a spectrum of cellular flows with just two components -a granule component that peaks at spherical wavenumbers of about 4000 and a supergranule component tha… Show more

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Cited by 18 publications
(8 citation statements)
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“…In this work, we address the impact that the granulation has on the formation and evolution of the surface magnetic fields and attempt to quantify their contribution for the evolution of the magnetic activity over several centuries. This research complements other recent work in the topic (e.g., Hathaway et al 2010;Krivodubskij 2010;Rempel & Cheung 2014). In particular, we clearly find a stochastic component on the sunspot area time series, which very likely is associated with the random nature of sunspot areas modified by the turbulent processes produced by the ascendant convective flows.…”
Section: Introductionsupporting
confidence: 86%
“…In this work, we address the impact that the granulation has on the formation and evolution of the surface magnetic fields and attempt to quantify their contribution for the evolution of the magnetic activity over several centuries. This research complements other recent work in the topic (e.g., Hathaway et al 2010;Krivodubskij 2010;Rempel & Cheung 2014). In particular, we clearly find a stochastic component on the sunspot area time series, which very likely is associated with the random nature of sunspot areas modified by the turbulent processes produced by the ascendant convective flows.…”
Section: Introductionsupporting
confidence: 86%
“…A different assumption is used for the correlation of charged-particle trajectories relative to individual magnetic lines of force compared with that used in the quasi-linear theory. For the parameters chosen in that study, the NLGC theory agrees better with the numerical simulations presented in the Matthaeus et al (2003) paper. recently Hathaway et al (2010). The cause of this discrepancy is still not clear, but may be related to the assumption of a divergence-free plasma velocity associated with solar supergranulation, as assumed by Giacalone and Jokipii (2004).…”
Section: Cross-field Diffusion Including Field-line Random Walkmentioning
confidence: 99%
“…We model this transport explicitly using an evolving convective flow pattern derived from Doppler measurements of the spectrum of the convective flows [ Hathaway et al , ]. The convective flow pattern itself is transported by prescribed differential rotation and meridional flow profiles by solving for the changes in the complex spectral coefficients produced by those axisymmetric flows [see Hathaway et al , ]. In addition to this slow evolution of the convection pattern, we give finite lifetimes to the convection cells by adding small, random rotations to the complex phases of each spectral coefficient at each time step.…”
Section: Surface Flux Transportmentioning
confidence: 99%