Isothermal Approximation vs. Differential Emission Measure Analysis: How Hot are Hot Loops?

Details Isothermal Approximation vs. Differential Emission Measure Analysis: How Hot are Hot Loops? Isothermal Approximation vs. Differential Emission Measure Analysis: How Hot are Hot Loops?

Jan 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002mwoc.conf...79c&link_type=abstract

Multi-Wavelength Observations of Coronal Structure and Dynamics -- Yohkoh 10th Anniversary Meeting. Proceedings of the conferenc

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Isothermal Approximation vs. Differential Emission Measure Analysis: How Hot are Hot LoopsNULL J. W. Cirtain and J. T. Schmelz Department of Physics, University of Memphis, Memphis, TN 38152 USA Abstract Analysis of EUV data from both EIT and TRACE suggests that active region loops may be isothermal. These results are in sharp contrast to the multi-thermal loops obtained from the analysis of X-ray data from SXT. The analysis of all these observations uses an isothermal approximation, but the EUV results are derived from narrow-band filter ratios while the X-ray results use a broad-band ratio. We have incorporated CDS data into the mix in two different ways: (a) we have used an isothermal approximation with different iron line ratios to determine temperatures at various pixels along a couple of (relatively) isolated coronal loops on the limb; and (b) we have used multiple spectral lines from the same data sets to produce differential emission measure distributions at these pixels. The data sets were obtained from observations taken on 13 Nov 1997 and 20 Apr 1998 by both CDS and SXT. We find that different instruments and/or different methods of analysis give different results. In some sense, this is not surprising since the limitations of the isothermal approximation are well understood. What is surprising, however, is that we sometimes forget these limitations.

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