34th Solar Physics Division Meeting, June 2003
Session 10 Transequatorial and other Coronal Structures
Oral, Tuesday, June 17, 2003, 9:00am-12:00noon, Auditorium

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[10.07] Evolving Active Region Loops Observed With TRACE

H.P. Warren, A.R. Winebarger, J.T. Mariska (NRL)

Recent observations with TRACE have revealed a new class of active region loops with very interesting properties. These loops have relatively flat filter ratios, suggesting approximately constant temperatures along much of the loop length, and large densities relative to the predictions of static loop models. Recent analysis has indicated that these loops first appear in the hotter filters before they appear in the cooler filters. The delay between the appearance of the loops in the different filters suggests that the loops are impulsively heated and are cooling when they are imaged with TRACE. In this paper we present time-dependent hydrodynamic modeling of evolving active region loops observed with TRACE. We find that by modeling the loops as small-scale, impulsively heated filaments we can generally reproduce the spatial and temporal properties of the observations. These results suggest that both dynamics and filamentation are crucial to understanding the observed properties of active region loops observed with TRACE.

This research has been funded by the NASA SR&T and Sun-Earth Connection Guest Investigator programs.


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© 2003. The American Astronomical Soceity.