Coronal Loop Temperatures Obtained with Hinode EIS and XRT Data

Details Coronal Loop Temperatures Obtained with Hinode EIS and XRT Data Coronal Loop Temperatures Obtained with Hinode EIS and XRT Data

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsp41c..01s&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #SP41C-01

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7509 Corona

Scientific paper

Data from the EUV Imaging Spectrometer (EIS) and the X-Ray Telescope (XRT) on Hinode are used to investigate the thermal properties of coronal loops. For background subtraction, we take a cut across the loop in areas where the background is relatively simple. EIS gives us density-sensitive line ratios, some of which give statistically different answers for the same background-subtracted plasma. In many cases, emission measure loci plots indicate that the loop plasma in not isothermal. Therefore, we have used two methods of differential emission measure analysis on these data. The first uses a forward folding method with a manual manipulation of the curve to evaluate the DEM based. Although this method is time-consuming, it forces the user to understand both the limitations of the data as well as the assumptions going into the analysis. The user has control of the final DEM shape and no smoothing is required beyond that imposed by the resolution of the G(T) functions (0.1 dex). The second method uses the automatic inversion technique where the DEM curve is represented with a series of spline knots that are repositioned interactively for more control over the smoothness of the DEM curve. This method represents the best of both worlds: the quickness of automatic inversion and the control of manual manipulation. In both cases, the best fit is determined from a chi-sq minimization of the differences between the observed and predicted intensities. We test three different models and compare the results: (1) an isothermal model; (2) a two-spike model; and (3) a broad DEM. When available, we also use TRACE images to help distinguish among these models. Solar physics research at the University of Memphis is supported by a Hinode subcontract from NASA/SAO as well as NSF ATM-0402729.

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