Modeling Active Regions with Steady and Impulsive Heating

Details Modeling Active Regions with Steady and Impulsive Heating Modeling Active Regions with Steady and Impulsive Heating

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.9124p&link_type=abstract

American Astronomical Society Meeting 210, #91.24; Bulletin of the American Astronomical Society, Vol. 39, p.208

Astronomy and Astrophysics

Astronomy

Scientific paper

There has been considerable recent interest in constructing physical models of active regions (ARs) and the global coronal. Models based on static equilibrium theory are quite successful at reproducing soft X-ray (SXR) images of active regions. They however fail to predict the warm ( 1 MK) loops that are seen to permeate ARs in the EUV. Instead, the synthetic EUV images are dominated by intense footpoint emission. We demonstrate that the failure of static models to predict EUV loops is associated with the very weak dependence of loop temperature on loop length in models that are based on a single heating mechanism and that match the SXR observations. The models predict either SXR loops or EUV loops, but not both. We therefore consider time-dependent AR models based on nanoflare heating. We demonstrate that such models can simultaneously reproduce both SXR and EUV loops. Moreover, they explain the general tendency for SXR emission to dominate in the cores of ARs and EUV emission to dominate in the periphery. We finally show how the properties of nanoflares (energy, duration, spatial dependence, repetition time) can affect the AR morphology.
Research supported by NASA and ONR.

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