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H.P. Warren, A.D. Warshall (Harvard-Smithsonian CfA)
Recent observations with TRACE have revealed a new class of relatively cool (~\,MK) active region loops that have flat temperature profiles and are much denser than would be expected from hydrostatic equilibrium. Hydrodynamic loop modeling shows that non-uniform, footpoint heating is consistent with the observed properties of some of these loops. In this paper we present temperature and density measurements derived from SUMER/SoHO observations of a quiet coronal streamer. The streamer is nearly isothermal at all observed heights (50--200\,Mm above the limb), indicating that the streamer is composed of loops with very flat temperature profiles. We also find that the densities measured at most heights are larger than would be expected from hydrostatic equilibrium. Loop models with non-uniform footpoint heating can reproduce the observed properties of this streamer at most heights.
This work has been supported by NAG5-11625 and NAG5-10786.
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Bulletin of the American Astronomical Society, 34
© 2002. The American Astronomical Soceity.