TRACE Active Region Loops: Observation and Modeling

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

Recent Transition Region and Coronal Explorer (TRACE) observations have detected active region coronal loops that can not be easily modeled using hydrostatic models. Analysis of these loops suggests that they are overdense relative to the predictions of hydrodynamic models with uniform heating. This modeling, however, assumes that the observed emission is near 1 MK. Since the TRACE filter ratios are actually multivalued and high-temperature, uniformly heated models are difficult to exclude based on the TRACE data alone. Using co-aligned CDS rasters of overdense TRACE loops we find that these loops contain material at 105.9 K to 106.2 K. From these rasters we perform a DEM analysis to constrain the input parameters to time-dependent hydrodynamic models of these loops. TRACE is supported by contract NAS5-38099 from NASA to LMATC.

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