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Static and Impulsive Models of Solar Active Regions View all abstracts by submitter

Spiros Patsourakos   Submitted: 2008-08-21 13:24

The physical modeling of active regions (ARs) and of the global coronal is receiving increasing interest lately. Recent attempts to model ARs using static equilibrium models were quite successful in reproducing AR images of hot soft X-ray (SXR) loops. They however failed to predict the bright EUV warm loops permeating ARs: the synthetic images were dominated by intense footpoint emission. We demonstrate that this failure is due to the very weak dependence of loop temperature on loop length which cannot simultaneously account for both hot and warm loops in the same AR. We then consider time-dependent AR models based on nanoflare heating. We demonstrate that such models can simultaneously reproduce EUV and SXR loops in ARs. Moreover, they predict radial intensity variations consistent with the localized core and extended emissions in SXR and EUV AR observations respectively. We finally show how the AR morphology can be used as a gauge of the properties (duration, energy, spatial dependence, repetition time) of the impulsive heating.

Authors: S. Patsourakos, J. A. Klimchuk
Projects: None

Publication Status: ApJ, 2008, in press
Last Modified: 2008-08-22 13:37
Go to main E-Print page  THE VARIATION OF RELATIVE MAGNETIC HELICITY
AROUND MAJOR FLARES  Parallel Motions of Coronal Hard X-ray Source and Hα Ribbons  Edit Entry  Download Preprint  Delete Entry 

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