Intermittent brightenings near the jet bases. a1–a4: NVST Hα blue wing image (Δλ = −0.5 Å), core image, red wing image (Δλ = +0.5 Å), and IRIS 1400 Å image showing the jets and associated brightenings (see the red contours) near the jet bases around 01:19 UT. The curves “Slice1” and “Slice2” in panel a3 approximate the projected trajectory of jet1 and jet2, respectively. b1–b4: similar to (a1)–(a4), but for the time point of 01:45 UT. An associated animation (figure2.mov) of Hα blue wing, core, and red wing images, covering 01:00 UT to 02:28 UT, is available online.