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Image name: Temp_struct_diffuse_corona.png (click image to enlarge)
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Date submitted: 30-Jan-1995
Date: 30 January 1995 Subject: Diffuse Corona This figure presents some preliminary results on the temperature structure of the diffuse corona. The upper LH picture is an example of how data are selected from an image. Within the bounded area the data are averaged over zones equidistant from sun center. These radial averages for the UL image and its AlMg mate are displayed at the upper right. I've done this for the same general region for 14 pairs of images spanning the period 7-may-92 02:53 to 9-may-92 16:16. Ratios of the radial averages yield the temperature vs. radius info in the lower LH plot -- where the solid line is the average over 0.5 to 1.5 solar radius, a region sampled in all the 14 pairs of images. From this average temperature and the average signal level I derived the column emission measure curve given in the lower right. This work has to be done again as the sun centers I used turn out not to be quite right because SXT_CEN did not know that the data cube had been aligned. I have to adjust for this somehow in my program RADIAL_AVG which I use to form the radially averaged values. However, they are close enough that the results will not change much. L. Acton 1/30/95
