... evolution

In particular, Orlando et al. (2004) have found that the core of active region AR 7978 is characterized by an average temperature which varies from $\approx$ $6\times 10^6$ K during the emergence of the active region (July 5-13, 1996) to $\approx$ $2\times 10^6$ K at the end of the core evolution circa one month later.

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