Figure 3. The SOHO/EIT derotated fixed-difference images with 6-hour time intervals in four channels of  304, 171, 195, and 284 Å illustrating the dimmings in different-temperature lines for two events of the 1st rotation (October 26, 2003 (a-d), November 4, 2003 (e-h)) and one event of the 2nd rotation (November 17, 2003 (i-l)). In frame d, the difference image with a 12-hour interval is presented because the 284 Å heliogram belonging to October 26, 19 UT is not available.

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