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Paper: The Evolution of the Sub-Surface Structure of Long-Lived Active Regions
Volume: 416, Solar-Stellar Dynamos as Revealed by Helio- and Asteroseismology: GONG 2008/SOHO 21
Page: 119
Authors: Baldner, C. S.; Bogart, R. S.; Basu, S.; Antia, H. M.
Abstract: The strongest active regions on the Sun are usually very long lived and are ideal candidates to study the sub-surface evolution of active regions through ring-diagram analysis. We do a ring-diagram analysis of several long-lived active regions. All selected groups last for more than two Carrington rotations. When the data is available, we track the regions from before their first appearance to after their final disappearance. We determined mode frequencies and velocity parameters from the active regions. The frequencies are inverted to determine how the wave-speed and adiabatic index evolve and the velocity parameters are inverted to determine flows below the regions. We use the inversion results to examine the evolution of structure and dynamics below the selected active regions.
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