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Article
Open AccessModeling the Subsurface Structure of Sunspots
While sunspots are easily observed at the solar surface, determining their subsurface structure is not trivial. There are two main hypotheses for the subsurface structure of sunspots: the monolithic model and ...
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Article
Large-Scale Zonal Flows Near the Solar Surface
Migrating bands of weak, zonal flow, associated with the activity bands in the solar cycle, have been observed at the solar surface for some time. More recently, these flows have been probed deep within the co...
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Article
Organized Subsurface Flows near Active Regions
Local helioseismic techniques, such as ring analysis and time-distance helioseismology, have already shown that large-scale flows near the surface converge towards major active regions. Ring analysis has furth...
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Article
Solar shear flows deduced from helioseismic dense-pack samplings of ring diagrams
We report on large-scale horizontal flows in the solar convection zone and their variability in time and space using a local-helioseismology technique known as ring-diagram analysis. By performing this analysi...