Active Region Loop Heating

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May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...200.1606a&link_type=abstract

American Astronomical Society, 200th AAS Meeting, #16.06; Bulletin of the American Astronomical Society, Vol. 34, p.668

Physics

Scientific paper

A long-standing unresolved question in solar physics is whether the heating in coronal loops is steady or impulsive. X-ray observations of high-temperature loops (T > 2 x 106 K) tend to show quasi-steady structures, (evolution slow compared to cooling time scales), whereas theoretical models strongly favor impulsive heating. We present simulations of impulsively heated loops using our adaptive-mesh-refinement code ARGOS, and compare the results with TRACE observations of the transition regions of high-temperature active region loops. From this comparison, we deduce that the heating in the core of active regions is quasi-steady rather than impulsive. These results pose a formidable challenge to developing theoretical models for the heating. This work was supported in part by NASA and ONR.

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