Variations of parameters for plasma blobs. (a): variation of blob number. The blue dashed lines represent the four instances (t1, t2, t3, and t4) that are used for the power-spectrum analysis in Fig. 5. (b): variations of blob width (black curve) and velocity (red curve). In (b), the vertical gray and orange lines indicate the standard errors. (c): normalized intensity variations of GOES 1−8 Å and AIA 94/211 Å in the region marked by the black contour in (d). In (a) and (c), the blue dashed lines marked by “t3” also represent the peak instance of the blob number. (d): AIA 211 Å image at 13:02:57 UT, showing a region (black contour) near the bottom of the current sheet.