Temperature Analysis of the Post-Flare Loops of June 25-26, 1992

We have performed an analysis of temperatures and emission measures of thermal plasma on a post--flare loop system following an X3.9 flare of June 25, 1992, at 20:14 UT in NOAA active region 7205 near the west limb (N09, W67). The filter ratio method was applied to the data sets taken using the Al 0.1 micron (thin Al) and Al 12 micron (thick Al) filters of the Yohkoh Soft X-ray Telescope (SXT). We found that the plasma temperature of the top of loops was in the range 5 - 8 x 10^6 K and log emission measure between 44.6 and 46.7 cm^(-3) for data sets taken from 22:56:57 UT of June 25 to 09:00 UT of June 26. Furthermore, the occurrence of a C1-class flare at the top of the flare loops increased the plasma temperature from 5.5 x 10^6 K to 6.6 x 10^6 K at 06:57:11 UT. The loops top was much brighter than the legs and footpoints, with delta_T was about 0.1 x 10^6 K.