Fig. 21.
Upper panel: map of τ for the active region AR11261 near the time of its observed eruption. Lower panel: evolution of τ for 8 active regions examined. In five of them an eruption was observed (AR11261, AR11561, AR11504, AR11437, AR11680 – red lines) and in three of them no eruption was observed (AR11480, AR11813, AR12455 – blue lines).
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