The Coronal Loop Controversy: Resolved!

Details The Coronal Loop Controversy: Resolved! The Coronal Loop Controversy: Resolved!

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006spd....37.1701s&link_type=abstract

American Astronomical Society, SPD meeting #37, #17.01; Bulletin of the American Astronomical Society, Vol. 38, p.245

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Scientific paper

Critics have pointed out the shortcomings of CDS coronal loop temperature analysis - the large pixel size and the slow time cadence. It is these limitations, some say, that have produced multithermal results for the loop observed with CDS on 1998 April 20, both along the line of sight and along the loop length. Analysis of the CDS observations of AR 10250 from 2003 January 17, however, seem to contradict these critics. Two loops sit side-by-side right along the slit in this raster, so all pixels in each loop were observed at the same time. As a result changes as a function of time will not affect the temperature results. The first loop is observed primarily in Mg IX (Log T = 6.0) and the second in Si XII (Log T = 6.3). Differential Emission Measure (DEM) analysis of background subtracted line intensities of pixels in each loop show distinctly different results. For the first loop, the intensities of the lines that remain after background subtraction are well fit with a DEM that collapses to a single spike. In other words, the loop plasma at this location is isothermal. This proves that it is neither the DEM method nor the CDS pixel size that produced the multithermal distributions for the 1998 April 20 loop plasma. In addition the DEM distribution for the second loop is similar to those produced for the 1998 April 20 loop and is clearly inconsistent with isothermal plasma. Both distributions change as a function of position along the loop, with the temperatures increasing with loop height. Solar physics research at the University of Memphis is supported by grants from NSF and NASA.

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