Abstract Using the subsurface flow maps obtained from the HMI time–distance data-analysis pipeline, I examine the temporal evolution of torsional oscillation, meridional flow, and long-living large-scale structures in high-latitude areas. During the 5.5-year analysis period, both the torsional oscillation and meridional flow show strong hemispheric asymmetry while persisting the converging-flow patterns toward the activity belts. Meanwhile, for both hemispheres in the mid-latitude zone, the meridional-flow speed shows an anti-correlation with the magnetic flux being transported toward the pole, slowing down (speeding up) when following-polarity (leading-polarity) magnetic flux is transported. In the latitudinal band studied, the meridional-flow speed and magnetic field remained relatively unchanged from 2012 through 2015 in the northern hemisphere, but varied substantially during the same period in the southern hemisphere. Long-living large-scale structures, characterized by their low zonal speed, are observed in high-latitude areas, but the nature and cause of these structures are unknown.
Solar large-scale flows obtained from the HMI time–distance data-analysis pipeline
Advances in Space Research ; 58 , 8 ; 1457-1463
2016-06-05
7 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Solar large-scale flows obtained from the HMI time–distance data-analysis pipeline
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