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Abstract: The physical modeling of active regions ARs and of the global coronal isreceiving increasing interest lately. Recent attempts to model ARs using staticequilibrium models were quite successful in reproducing AR images of hot softX-ray SXR loops. They however failed to predict the bright EUV warm loopspermeating ARs: the synthetic images were dominated by intense footpointemission. We demonstrate that this failure is due to the very weak dependenceof loop temperature on loop length which cannot simultaneously account for bothhot and warm loops in the same AR. We then consider time-dependent AR modelsbased on nanoflare heating. We demonstrate that such models can simultaneouslyreproduce EUV and SXR loops in ARs. Moreover, they predict radial intensityvariations consistent with the localized core and extended emissions in SXR andEUV AR observations respectively. We finally show how the AR morphology can beused as a gauge of the properties duration, energy, spatial dependence,repetition time of the impulsive heating.

Autor: S. Patsourakos, J. A. Klimchuk


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